diff --git a/apps/web/app/api/v1/client/[environmentId]/contacts/[userId]/attributes/route.ts b/apps/web/app/api/v1/client/[environmentId]/contacts/[userId]/attributes/route.ts
index f2943a511c..0d30268d09 100644
--- a/apps/web/app/api/v1/client/[environmentId]/contacts/[userId]/attributes/route.ts
+++ b/apps/web/app/api/v1/client/[environmentId]/contacts/[userId]/attributes/route.ts
@@ -1,6 +1,6 @@
 import {
   OPTIONS,
   PUT,
-} from "@/modules/ee/contacts/api/client/[environmentId]/contacts/[userId]/attributes/route";
+} from "@/modules/ee/contacts/api/v1/client/[environmentId]/contacts/[userId]/attributes/route";
 
 export { OPTIONS, PUT };
diff --git a/apps/web/app/api/v1/client/[environmentId]/identify/contacts/[userId]/route.ts b/apps/web/app/api/v1/client/[environmentId]/identify/contacts/[userId]/route.ts
index b81a65e3b3..811f041294 100644
--- a/apps/web/app/api/v1/client/[environmentId]/identify/contacts/[userId]/route.ts
+++ b/apps/web/app/api/v1/client/[environmentId]/identify/contacts/[userId]/route.ts
@@ -1,6 +1,6 @@
 import {
   GET,
   OPTIONS,
-} from "@/modules/ee/contacts/api/client/[environmentId]/identify/contacts/[userId]/route";
+} from "@/modules/ee/contacts/api/v1/client/[environmentId]/identify/contacts/[userId]/route";
 
 export { GET, OPTIONS };
diff --git a/apps/web/app/api/v1/client/[environmentId]/user/route.ts b/apps/web/app/api/v1/client/[environmentId]/user/route.ts
index 0198ac1f99..aee569e43e 100644
--- a/apps/web/app/api/v1/client/[environmentId]/user/route.ts
+++ b/apps/web/app/api/v1/client/[environmentId]/user/route.ts
@@ -1,3 +1,3 @@
-import { OPTIONS, POST } from "@/modules/ee/contacts/api/client/[environmentId]/user/route";
+import { OPTIONS, POST } from "@/modules/ee/contacts/api/v1/client/[environmentId]/user/route";
 
 export { POST, OPTIONS };
diff --git a/apps/web/app/api/v1/management/contact-attribute-keys/[contactAttributeKeyId]/route.ts b/apps/web/app/api/v1/management/contact-attribute-keys/[contactAttributeKeyId]/route.ts
index 7a0a88f40d..646b58f786 100644
--- a/apps/web/app/api/v1/management/contact-attribute-keys/[contactAttributeKeyId]/route.ts
+++ b/apps/web/app/api/v1/management/contact-attribute-keys/[contactAttributeKeyId]/route.ts
@@ -2,6 +2,6 @@ import {
   DELETE,
   GET,
   PUT,
-} from "@/modules/ee/contacts/api/management/contact-attribute-keys/[contactAttributeKeyId]/route";
+} from "@/modules/ee/contacts/api/v1/management/contact-attribute-keys/[contactAttributeKeyId]/route";
 
 export { DELETE, GET, PUT };
diff --git a/apps/web/app/api/v1/management/contact-attribute-keys/route.ts b/apps/web/app/api/v1/management/contact-attribute-keys/route.ts
index a9eff8127f..e40b29f2b7 100644
--- a/apps/web/app/api/v1/management/contact-attribute-keys/route.ts
+++ b/apps/web/app/api/v1/management/contact-attribute-keys/route.ts
@@ -1,3 +1,3 @@
-import { GET, POST } from "@/modules/ee/contacts/api/management/contact-attribute-keys/route";
+import { GET, POST } from "@/modules/ee/contacts/api/v1/management/contact-attribute-keys/route";
 
 export { GET, POST };
diff --git a/apps/web/app/api/v1/management/contact-attributes/route.ts b/apps/web/app/api/v1/management/contact-attributes/route.ts
index 4e26dd5645..72199b2630 100644
--- a/apps/web/app/api/v1/management/contact-attributes/route.ts
+++ b/apps/web/app/api/v1/management/contact-attributes/route.ts
@@ -1,3 +1,3 @@
-import { GET } from "@/modules/ee/contacts/api/management/contact-attributes/route";
+import { GET } from "@/modules/ee/contacts/api/v1/management/contact-attributes/route";
 
 export { GET };
diff --git a/apps/web/app/api/v1/management/contacts/[contactId]/route.ts b/apps/web/app/api/v1/management/contacts/[contactId]/route.ts
index a9598fd22c..f4acf186b4 100644
--- a/apps/web/app/api/v1/management/contacts/[contactId]/route.ts
+++ b/apps/web/app/api/v1/management/contacts/[contactId]/route.ts
@@ -1,3 +1,3 @@
-import { DELETE, GET } from "@/modules/ee/contacts/api/management/contacts/[contactId]/route";
+import { DELETE, GET } from "@/modules/ee/contacts/api/v1/management/contacts/[contactId]/route";
 
 export { DELETE, GET };
diff --git a/apps/web/app/api/v1/management/contacts/route.ts b/apps/web/app/api/v1/management/contacts/route.ts
index 05c986e528..7e826822e3 100644
--- a/apps/web/app/api/v1/management/contacts/route.ts
+++ b/apps/web/app/api/v1/management/contacts/route.ts
@@ -1,4 +1,4 @@
-import { GET } from "@/modules/ee/contacts/api/management/contacts/route";
+import { GET } from "@/modules/ee/contacts/api/v1/management/contacts/route";
 
 export { GET };
 
diff --git a/apps/web/app/api/v2/client/[environmentId]/contacts/[userId]/attributes/route.ts b/apps/web/app/api/v2/client/[environmentId]/contacts/[userId]/attributes/route.ts
index f2943a511c..0d30268d09 100644
--- a/apps/web/app/api/v2/client/[environmentId]/contacts/[userId]/attributes/route.ts
+++ b/apps/web/app/api/v2/client/[environmentId]/contacts/[userId]/attributes/route.ts
@@ -1,6 +1,6 @@
 import {
   OPTIONS,
   PUT,
-} from "@/modules/ee/contacts/api/client/[environmentId]/contacts/[userId]/attributes/route";
+} from "@/modules/ee/contacts/api/v1/client/[environmentId]/contacts/[userId]/attributes/route";
 
 export { OPTIONS, PUT };
diff --git a/apps/web/app/api/v2/client/[environmentId]/identify/contacts/[userId]/route.ts b/apps/web/app/api/v2/client/[environmentId]/identify/contacts/[userId]/route.ts
index b81a65e3b3..811f041294 100644
--- a/apps/web/app/api/v2/client/[environmentId]/identify/contacts/[userId]/route.ts
+++ b/apps/web/app/api/v2/client/[environmentId]/identify/contacts/[userId]/route.ts
@@ -1,6 +1,6 @@
 import {
   GET,
   OPTIONS,
-} from "@/modules/ee/contacts/api/client/[environmentId]/identify/contacts/[userId]/route";
+} from "@/modules/ee/contacts/api/v1/client/[environmentId]/identify/contacts/[userId]/route";
 
 export { GET, OPTIONS };
diff --git a/apps/web/app/api/v2/client/[environmentId]/user/route.ts b/apps/web/app/api/v2/client/[environmentId]/user/route.ts
index 0198ac1f99..aee569e43e 100644
--- a/apps/web/app/api/v2/client/[environmentId]/user/route.ts
+++ b/apps/web/app/api/v2/client/[environmentId]/user/route.ts
@@ -1,3 +1,3 @@
-import { OPTIONS, POST } from "@/modules/ee/contacts/api/client/[environmentId]/user/route";
+import { OPTIONS, POST } from "@/modules/ee/contacts/api/v1/client/[environmentId]/user/route";
 
 export { POST, OPTIONS };
diff --git a/apps/web/app/api/v2/management/contacts/bulk/route.ts b/apps/web/app/api/v2/management/contacts/bulk/route.ts
new file mode 100644
index 0000000000..c41aa59a2e
--- /dev/null
+++ b/apps/web/app/api/v2/management/contacts/bulk/route.ts
@@ -0,0 +1,3 @@
+import { PUT } from "@/modules/ee/contacts/api/v2/management/contacts/bulk/route";
+
+export { PUT };
diff --git a/apps/web/middleware.ts b/apps/web/middleware.ts
index fe1cd0adc5..e79837acc8 100644
--- a/apps/web/middleware.ts
+++ b/apps/web/middleware.ts
@@ -39,7 +39,12 @@ const enforceHttps = (request: NextRequest): Response | null => {
   if (IS_PRODUCTION && !E2E_TESTING && forwardedProto !== "https") {
     const apiError: ApiErrorResponseV2 = {
       type: "forbidden",
-      details: [{ field: "", issue: "Only HTTPS connections are allowed on the management endpoint." }],
+      details: [
+        {
+          field: "",
+          issue: "Only HTTPS connections are allowed on the management and contacts bulk endpoints.",
+        },
+      ],
     };
     logApiError(request, apiError);
     return NextResponse.json(apiError, { status: 403 });
diff --git a/apps/web/modules/api/v2/lib/response.ts b/apps/web/modules/api/v2/lib/response.ts
index 7eeeea0162..e3dc4c03f9 100644
--- a/apps/web/modules/api/v2/lib/response.ts
+++ b/apps/web/modules/api/v2/lib/response.ts
@@ -257,6 +257,34 @@ const successResponse = ({
   );
 };
 
+export const multiStatusResponse = ({
+  data,
+  meta,
+  cors = false,
+  cache = "private, no-store",
+}: {
+  data: Object;
+  meta?: Record<string, unknown>;
+  cors?: boolean;
+  cache?: string;
+}) => {
+  const headers = {
+    ...(cors && corsHeaders),
+    "Cache-Control": cache,
+  };
+
+  return Response.json(
+    {
+      data,
+      meta,
+    } as ApiSuccessResponse,
+    {
+      status: 207,
+      headers,
+    }
+  );
+};
+
 export const responses = {
   badRequestResponse,
   unauthorizedResponse,
@@ -267,4 +295,5 @@ export const responses = {
   tooManyRequestsResponse,
   internalServerErrorResponse,
   successResponse,
+  multiStatusResponse,
 };
diff --git a/apps/web/modules/api/v2/lib/utils.ts b/apps/web/modules/api/v2/lib/utils.ts
index f429c70240..92c9dbe9cc 100644
--- a/apps/web/modules/api/v2/lib/utils.ts
+++ b/apps/web/modules/api/v2/lib/utils.ts
@@ -1,6 +1,6 @@
 import { responses } from "@/modules/api/v2/lib/response";
 import { ApiErrorResponseV2 } from "@/modules/api/v2/types/api-error";
-import { ZodError } from "zod";
+import { ZodCustomIssue, ZodIssue } from "zod";
 import { logger } from "@formbricks/logger";
 
 export const handleApiError = (request: Request, err: ApiErrorResponseV2): Response => {
@@ -34,11 +34,16 @@ export const handleApiError = (request: Request, err: ApiErrorResponseV2): Respo
   }
 };
 
-export const formatZodError = (error: ZodError) => {
-  return error.issues.map((issue) => ({
-    field: issue.path.join("."),
-    issue: issue.message,
-  }));
+export const formatZodError = (error: { issues: (ZodIssue | ZodCustomIssue)[] }) => {
+  return error.issues.map((issue) => {
+    const issueParams = issue.code === "custom" ? issue.params : undefined;
+
+    return {
+      field: issue.path.join("."),
+      issue: issue.message ?? "An error occurred while processing your request. Please try again later.",
+      ...(issueParams && { meta: issueParams }),
+    };
+  });
 };
 
 export const logApiRequest = (request: Request, responseStatus: number): void => {
diff --git a/apps/web/modules/api/v2/management/auth/api-wrapper.ts b/apps/web/modules/api/v2/management/auth/api-wrapper.ts
index 53d7900fff..1a4cc8d1c8 100644
--- a/apps/web/modules/api/v2/management/auth/api-wrapper.ts
+++ b/apps/web/modules/api/v2/management/auth/api-wrapper.ts
@@ -2,7 +2,6 @@ import { checkRateLimitAndThrowError } from "@/modules/api/v2/lib/rate-limit";
 import { formatZodError, handleApiError } from "@/modules/api/v2/lib/utils";
 import { ZodRawShape, z } from "zod";
 import { TAuthenticationApiKey } from "@formbricks/types/auth";
-import { err } from "@formbricks/types/error-handlers";
 import { authenticateRequest } from "./authenticate-request";
 
 export type HandlerFn<TInput = Record<string, unknown>> = ({
@@ -41,65 +40,63 @@ export const apiWrapper = async <S extends ExtendedSchemas>({
   rateLimit?: boolean;
   handler: HandlerFn<ParsedSchemas<S>>;
 }): Promise<Response> => {
-  try {
-    const authentication = await authenticateRequest(request);
-    if (!authentication.ok) return handleApiError(request, authentication.error);
-
-    let parsedInput: ParsedSchemas<S> = {} as ParsedSchemas<S>;
-
-    if (schemas?.body) {
-      const bodyData = await request.json();
-      const bodyResult = schemas.body.safeParse(bodyData);
-
-      if (!bodyResult.success) {
-        throw err({
-          type: "bad_request",
-          details: formatZodError(bodyResult.error),
-        });
-      }
-      parsedInput.body = bodyResult.data as ParsedSchemas<S>["body"];
-    }
-
-    if (schemas?.query) {
-      const url = new URL(request.url);
-      const queryObject = Object.fromEntries(url.searchParams.entries());
-      const queryResult = schemas.query.safeParse(queryObject);
-      if (!queryResult.success) {
-        throw err({
-          type: "unprocessable_entity",
-          details: formatZodError(queryResult.error),
-        });
-      }
-      parsedInput.query = queryResult.data as ParsedSchemas<S>["query"];
-    }
-
-    if (schemas?.params) {
-      const paramsObject = (await externalParams) || {};
-      const paramsResult = schemas.params.safeParse(paramsObject);
-      if (!paramsResult.success) {
-        throw err({
-          type: "unprocessable_entity",
-          details: formatZodError(paramsResult.error),
-        });
-      }
-      parsedInput.params = paramsResult.data as ParsedSchemas<S>["params"];
-    }
-
-    if (rateLimit) {
-      const rateLimitResponse = await checkRateLimitAndThrowError({
-        identifier: authentication.data.hashedApiKey,
-      });
-      if (!rateLimitResponse.ok) {
-        throw rateLimitResponse.error;
-      }
-    }
-
-    return handler({
-      authentication: authentication.data,
-      parsedInput,
-      request,
-    });
-  } catch (err) {
-    return handleApiError(request, err.error);
+  const authentication = await authenticateRequest(request);
+  if (!authentication.ok) {
+    return handleApiError(request, authentication.error);
   }
+
+  let parsedInput: ParsedSchemas<S> = {} as ParsedSchemas<S>;
+
+  if (schemas?.body) {
+    const bodyData = await request.json();
+    const bodyResult = schemas.body.safeParse(bodyData);
+
+    if (!bodyResult.success) {
+      return handleApiError(request, {
+        type: "unprocessable_entity",
+        details: formatZodError(bodyResult.error),
+      });
+    }
+    parsedInput.body = bodyResult.data as ParsedSchemas<S>["body"];
+  }
+
+  if (schemas?.query) {
+    const url = new URL(request.url);
+    const queryObject = Object.fromEntries(url.searchParams.entries());
+    const queryResult = schemas.query.safeParse(queryObject);
+    if (!queryResult.success) {
+      return handleApiError(request, {
+        type: "unprocessable_entity",
+        details: formatZodError(queryResult.error),
+      });
+    }
+    parsedInput.query = queryResult.data as ParsedSchemas<S>["query"];
+  }
+
+  if (schemas?.params) {
+    const paramsObject = (await externalParams) || {};
+    const paramsResult = schemas.params.safeParse(paramsObject);
+    if (!paramsResult.success) {
+      return handleApiError(request, {
+        type: "unprocessable_entity",
+        details: formatZodError(paramsResult.error),
+      });
+    }
+    parsedInput.params = paramsResult.data as ParsedSchemas<S>["params"];
+  }
+
+  if (rateLimit) {
+    const rateLimitResponse = await checkRateLimitAndThrowError({
+      identifier: authentication.data.hashedApiKey,
+    });
+    if (!rateLimitResponse.ok) {
+      return handleApiError(request, rateLimitResponse.error);
+    }
+  }
+
+  return handler({
+    authentication: authentication.data,
+    parsedInput,
+    request,
+  });
 };
diff --git a/apps/web/modules/api/v2/management/auth/authenticated-api-client.ts b/apps/web/modules/api/v2/management/auth/authenticated-api-client.ts
index 1b2aff7c2b..7a14151732 100644
--- a/apps/web/modules/api/v2/management/auth/authenticated-api-client.ts
+++ b/apps/web/modules/api/v2/management/auth/authenticated-api-client.ts
@@ -1,4 +1,5 @@
-import { logApiRequest } from "@/modules/api/v2/lib/utils";
+import { handleApiError, logApiRequest } from "@/modules/api/v2/lib/utils";
+import { ApiErrorResponseV2 } from "@/modules/api/v2/types/api-error";
 import { ExtendedSchemas, HandlerFn, ParsedSchemas, apiWrapper } from "./api-wrapper";
 
 export const authenticatedApiClient = async <S extends ExtendedSchemas>({
@@ -14,16 +15,28 @@ export const authenticatedApiClient = async <S extends ExtendedSchemas>({
   rateLimit?: boolean;
   handler: HandlerFn<ParsedSchemas<S>>;
 }): Promise<Response> => {
-  const response = await apiWrapper({
-    request,
-    schemas,
-    externalParams,
-    rateLimit,
-    handler,
-  });
-  if (response.ok) {
-    logApiRequest(request, response.status);
-  }
+  try {
+    const response = await apiWrapper({
+      request,
+      schemas,
+      externalParams,
+      rateLimit,
+      handler,
+    });
 
-  return response;
+    if (response.ok) {
+      logApiRequest(request, response.status);
+    }
+
+    return response;
+  } catch (err) {
+    if ("type" in err) {
+      return handleApiError(request, err as ApiErrorResponseV2);
+    }
+
+    return handleApiError(request, {
+      type: "internal_server_error",
+      details: [{ field: "error", issue: "An error occurred while processing your request." }],
+    });
+  }
 };
diff --git a/apps/web/modules/api/v2/management/auth/tests/api-wrapper.test.ts b/apps/web/modules/api/v2/management/auth/tests/api-wrapper.test.ts
index ac89f211c4..33e2a17145 100644
--- a/apps/web/modules/api/v2/management/auth/tests/api-wrapper.test.ts
+++ b/apps/web/modules/api/v2/management/auth/tests/api-wrapper.test.ts
@@ -19,6 +19,11 @@ vi.mock("@/modules/api/v2/lib/utils", () => ({
   handleApiError: vi.fn(),
 }));
 
+vi.mock("@/modules/api/v2/lib/utils", () => ({
+  formatZodError: vi.fn(),
+  handleApiError: vi.fn(),
+}));
+
 describe("apiWrapper", () => {
   it("should handle request and return response", async () => {
     const request = new Request("http://localhost", {
diff --git a/apps/web/modules/api/v2/openapi-document.ts b/apps/web/modules/api/v2/openapi-document.ts
index d58ee1de0a..da89199cb7 100644
--- a/apps/web/modules/api/v2/openapi-document.ts
+++ b/apps/web/modules/api/v2/openapi-document.ts
@@ -5,6 +5,7 @@ import { responsePaths } from "@/modules/api/v2/management/responses/lib/openapi
 import { rolePaths } from "@/modules/api/v2/management/roles/lib/openapi";
 import { surveyPaths } from "@/modules/api/v2/management/surveys/lib/openapi";
 import { webhookPaths } from "@/modules/api/v2/management/webhooks/lib/openapi";
+import { bulkContactPaths } from "@/modules/ee/contacts/api/v2/management/contacts/bulk/lib/openapi";
 import * as yaml from "yaml";
 import { z } from "zod";
 import { createDocument, extendZodWithOpenApi } from "zod-openapi";
@@ -26,6 +27,7 @@ const document = createDocument({
   },
   paths: {
     ...responsePaths,
+    ...bulkContactPaths,
     ...contactPaths,
     ...contactAttributePaths,
     ...contactAttributeKeyPaths,
diff --git a/apps/web/modules/api/v2/types/api-error.ts b/apps/web/modules/api/v2/types/api-error.ts
index 06e69c3f49..10b8470232 100644
--- a/apps/web/modules/api/v2/types/api-error.ts
+++ b/apps/web/modules/api/v2/types/api-error.ts
@@ -1,4 +1,12 @@
-export type ApiErrorDetails = { field: string; issue: string }[];
+// We're naming the "params" field from zod (or otherwise) to "meta" since "params" is a bit confusing
+// We're still using the "params" type from zod though because it allows us to not reference `any` and directly use the zod types
+export type ApiErrorDetails = {
+  field: string;
+  issue: string;
+  meta?: {
+    [k: string]: unknown;
+  };
+}[];
 
 export type ApiErrorResponseV2 =
   | {
diff --git a/apps/web/modules/ee/contacts/api/client/[environmentId]/contacts/[userId]/attributes/lib/contact.ts b/apps/web/modules/ee/contacts/api/v1/client/[environmentId]/contacts/[userId]/attributes/lib/contact.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/client/[environmentId]/contacts/[userId]/attributes/lib/contact.ts
rename to apps/web/modules/ee/contacts/api/v1/client/[environmentId]/contacts/[userId]/attributes/lib/contact.ts
diff --git a/apps/web/modules/ee/contacts/api/client/[environmentId]/contacts/[userId]/attributes/route.ts b/apps/web/modules/ee/contacts/api/v1/client/[environmentId]/contacts/[userId]/attributes/route.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/client/[environmentId]/contacts/[userId]/attributes/route.ts
rename to apps/web/modules/ee/contacts/api/v1/client/[environmentId]/contacts/[userId]/attributes/route.ts
diff --git a/apps/web/modules/ee/contacts/api/client/[environmentId]/identify/contacts/[userId]/lib/attributes.ts b/apps/web/modules/ee/contacts/api/v1/client/[environmentId]/identify/contacts/[userId]/lib/attributes.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/client/[environmentId]/identify/contacts/[userId]/lib/attributes.ts
rename to apps/web/modules/ee/contacts/api/v1/client/[environmentId]/identify/contacts/[userId]/lib/attributes.ts
diff --git a/apps/web/modules/ee/contacts/api/client/[environmentId]/identify/contacts/[userId]/lib/contact.ts b/apps/web/modules/ee/contacts/api/v1/client/[environmentId]/identify/contacts/[userId]/lib/contact.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/client/[environmentId]/identify/contacts/[userId]/lib/contact.ts
rename to apps/web/modules/ee/contacts/api/v1/client/[environmentId]/identify/contacts/[userId]/lib/contact.ts
diff --git a/apps/web/modules/ee/contacts/api/client/[environmentId]/identify/contacts/[userId]/lib/personState.ts b/apps/web/modules/ee/contacts/api/v1/client/[environmentId]/identify/contacts/[userId]/lib/personState.ts
similarity index 97%
rename from apps/web/modules/ee/contacts/api/client/[environmentId]/identify/contacts/[userId]/lib/personState.ts
rename to apps/web/modules/ee/contacts/api/v1/client/[environmentId]/identify/contacts/[userId]/lib/personState.ts
index dc0d7e6729..36e0ae4b16 100644
--- a/apps/web/modules/ee/contacts/api/client/[environmentId]/identify/contacts/[userId]/lib/personState.ts
+++ b/apps/web/modules/ee/contacts/api/v1/client/[environmentId]/identify/contacts/[userId]/lib/personState.ts
@@ -1,6 +1,6 @@
 import { contactCache } from "@/lib/cache/contact";
 import { contactAttributeCache } from "@/lib/cache/contact-attribute";
-import { getContactByUserId } from "@/modules/ee/contacts/api/client/[environmentId]/identify/contacts/[userId]/lib/contact";
+import { getContactByUserId } from "@/modules/ee/contacts/api/v1/client/[environmentId]/identify/contacts/[userId]/lib/contact";
 import { prisma } from "@formbricks/database";
 import { cache } from "@formbricks/lib/cache";
 import { segmentCache } from "@formbricks/lib/cache/segment";
diff --git a/apps/web/modules/ee/contacts/api/client/[environmentId]/identify/contacts/[userId]/lib/segments.ts b/apps/web/modules/ee/contacts/api/v1/client/[environmentId]/identify/contacts/[userId]/lib/segments.ts
similarity index 97%
rename from apps/web/modules/ee/contacts/api/client/[environmentId]/identify/contacts/[userId]/lib/segments.ts
rename to apps/web/modules/ee/contacts/api/v1/client/[environmentId]/identify/contacts/[userId]/lib/segments.ts
index 50b0a3ab80..cf6ae0c9b6 100644
--- a/apps/web/modules/ee/contacts/api/client/[environmentId]/identify/contacts/[userId]/lib/segments.ts
+++ b/apps/web/modules/ee/contacts/api/v1/client/[environmentId]/identify/contacts/[userId]/lib/segments.ts
@@ -1,5 +1,5 @@
 import { contactAttributeCache } from "@/lib/cache/contact-attribute";
-import { getContactAttributes } from "@/modules/ee/contacts/api/client/[environmentId]/identify/contacts/[userId]/lib/attributes";
+import { getContactAttributes } from "@/modules/ee/contacts/api/v1/client/[environmentId]/identify/contacts/[userId]/lib/attributes";
 import { evaluateSegment } from "@/modules/ee/contacts/segments/lib/segments";
 import { Prisma } from "@prisma/client";
 import { cache as reactCache } from "react";
diff --git a/apps/web/modules/ee/contacts/api/client/[environmentId]/identify/contacts/[userId]/route.ts b/apps/web/modules/ee/contacts/api/v1/client/[environmentId]/identify/contacts/[userId]/route.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/client/[environmentId]/identify/contacts/[userId]/route.ts
rename to apps/web/modules/ee/contacts/api/v1/client/[environmentId]/identify/contacts/[userId]/route.ts
diff --git a/apps/web/modules/ee/contacts/api/client/[environmentId]/user/lib/contact.ts b/apps/web/modules/ee/contacts/api/v1/client/[environmentId]/user/lib/contact.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/client/[environmentId]/user/lib/contact.ts
rename to apps/web/modules/ee/contacts/api/v1/client/[environmentId]/user/lib/contact.ts
diff --git a/apps/web/modules/ee/contacts/api/client/[environmentId]/user/lib/segments.ts b/apps/web/modules/ee/contacts/api/v1/client/[environmentId]/user/lib/segments.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/client/[environmentId]/user/lib/segments.ts
rename to apps/web/modules/ee/contacts/api/v1/client/[environmentId]/user/lib/segments.ts
diff --git a/apps/web/modules/ee/contacts/api/client/[environmentId]/user/lib/update-user.ts b/apps/web/modules/ee/contacts/api/v1/client/[environmentId]/user/lib/update-user.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/client/[environmentId]/user/lib/update-user.ts
rename to apps/web/modules/ee/contacts/api/v1/client/[environmentId]/user/lib/update-user.ts
diff --git a/apps/web/modules/ee/contacts/api/client/[environmentId]/user/lib/user-state.ts b/apps/web/modules/ee/contacts/api/v1/client/[environmentId]/user/lib/user-state.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/client/[environmentId]/user/lib/user-state.ts
rename to apps/web/modules/ee/contacts/api/v1/client/[environmentId]/user/lib/user-state.ts
diff --git a/apps/web/modules/ee/contacts/api/client/[environmentId]/user/route.ts b/apps/web/modules/ee/contacts/api/v1/client/[environmentId]/user/route.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/client/[environmentId]/user/route.ts
rename to apps/web/modules/ee/contacts/api/v1/client/[environmentId]/user/route.ts
diff --git a/apps/web/modules/ee/contacts/api/management/contact-attribute-keys/[contactAttributeKeyId]/lib/contact-attribute-key.ts b/apps/web/modules/ee/contacts/api/v1/management/contact-attribute-keys/[contactAttributeKeyId]/lib/contact-attribute-key.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/management/contact-attribute-keys/[contactAttributeKeyId]/lib/contact-attribute-key.ts
rename to apps/web/modules/ee/contacts/api/v1/management/contact-attribute-keys/[contactAttributeKeyId]/lib/contact-attribute-key.ts
diff --git a/apps/web/modules/ee/contacts/api/management/contact-attribute-keys/[contactAttributeKeyId]/route.ts b/apps/web/modules/ee/contacts/api/v1/management/contact-attribute-keys/[contactAttributeKeyId]/route.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/management/contact-attribute-keys/[contactAttributeKeyId]/route.ts
rename to apps/web/modules/ee/contacts/api/v1/management/contact-attribute-keys/[contactAttributeKeyId]/route.ts
diff --git a/apps/web/modules/ee/contacts/api/management/contact-attribute-keys/[contactAttributeKeyId]/types/contact-attribute-keys.ts b/apps/web/modules/ee/contacts/api/v1/management/contact-attribute-keys/[contactAttributeKeyId]/types/contact-attribute-keys.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/management/contact-attribute-keys/[contactAttributeKeyId]/types/contact-attribute-keys.ts
rename to apps/web/modules/ee/contacts/api/v1/management/contact-attribute-keys/[contactAttributeKeyId]/types/contact-attribute-keys.ts
diff --git a/apps/web/modules/ee/contacts/api/management/contact-attribute-keys/lib/contact-attribute-keys.ts b/apps/web/modules/ee/contacts/api/v1/management/contact-attribute-keys/lib/contact-attribute-keys.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/management/contact-attribute-keys/lib/contact-attribute-keys.ts
rename to apps/web/modules/ee/contacts/api/v1/management/contact-attribute-keys/lib/contact-attribute-keys.ts
diff --git a/apps/web/modules/ee/contacts/api/management/contact-attribute-keys/route.ts b/apps/web/modules/ee/contacts/api/v1/management/contact-attribute-keys/route.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/management/contact-attribute-keys/route.ts
rename to apps/web/modules/ee/contacts/api/v1/management/contact-attribute-keys/route.ts
diff --git a/apps/web/modules/ee/contacts/api/management/contact-attributes/lib/contact-attributes.ts b/apps/web/modules/ee/contacts/api/v1/management/contact-attributes/lib/contact-attributes.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/management/contact-attributes/lib/contact-attributes.ts
rename to apps/web/modules/ee/contacts/api/v1/management/contact-attributes/lib/contact-attributes.ts
diff --git a/apps/web/modules/ee/contacts/api/management/contact-attributes/route.ts b/apps/web/modules/ee/contacts/api/v1/management/contact-attributes/route.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/management/contact-attributes/route.ts
rename to apps/web/modules/ee/contacts/api/v1/management/contact-attributes/route.ts
diff --git a/apps/web/modules/ee/contacts/api/management/contacts/[contactId]/lib/contact.ts b/apps/web/modules/ee/contacts/api/v1/management/contacts/[contactId]/lib/contact.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/management/contacts/[contactId]/lib/contact.ts
rename to apps/web/modules/ee/contacts/api/v1/management/contacts/[contactId]/lib/contact.ts
diff --git a/apps/web/modules/ee/contacts/api/management/contacts/[contactId]/route.ts b/apps/web/modules/ee/contacts/api/v1/management/contacts/[contactId]/route.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/management/contacts/[contactId]/route.ts
rename to apps/web/modules/ee/contacts/api/v1/management/contacts/[contactId]/route.ts
diff --git a/apps/web/modules/ee/contacts/api/management/contacts/lib/contacts.ts b/apps/web/modules/ee/contacts/api/v1/management/contacts/lib/contacts.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/management/contacts/lib/contacts.ts
rename to apps/web/modules/ee/contacts/api/v1/management/contacts/lib/contacts.ts
diff --git a/apps/web/modules/ee/contacts/api/management/contacts/route.ts b/apps/web/modules/ee/contacts/api/v1/management/contacts/route.ts
similarity index 100%
rename from apps/web/modules/ee/contacts/api/management/contacts/route.ts
rename to apps/web/modules/ee/contacts/api/v1/management/contacts/route.ts
diff --git a/apps/web/modules/ee/contacts/api/v2/management/contacts/bulk/lib/contact.ts b/apps/web/modules/ee/contacts/api/v2/management/contacts/bulk/lib/contact.ts
new file mode 100644
index 0000000000..200f8b40bb
--- /dev/null
+++ b/apps/web/modules/ee/contacts/api/v2/management/contacts/bulk/lib/contact.ts
@@ -0,0 +1,398 @@
+import { contactCache } from "@/lib/cache/contact";
+import { contactAttributeCache } from "@/lib/cache/contact-attribute";
+import { contactAttributeKeyCache } from "@/lib/cache/contact-attribute-key";
+import { ApiErrorResponseV2 } from "@/modules/api/v2/types/api-error";
+import { TContactBulkUploadContact } from "@/modules/ee/contacts/types/contact";
+import { createId } from "@paralleldrive/cuid2";
+import { Prisma } from "@prisma/client";
+import { prisma } from "@formbricks/database";
+import { logger } from "@formbricks/logger";
+import { Result, err, ok } from "@formbricks/types/error-handlers";
+
+export const upsertBulkContacts = async (
+  contacts: TContactBulkUploadContact[],
+  environmentId: string,
+  parsedEmails: string[]
+): Promise<
+  Result<
+    {
+      contactIdxWithConflictingUserIds: number[];
+    },
+    ApiErrorResponseV2
+  >
+> => {
+  const emailAttributeKey = "email";
+  const contactIdxWithConflictingUserIds: number[] = [];
+
+  let userIdsInContacts: string[] = [];
+  let attributeKeysSet: Set<string> = new Set();
+  let attributeKeys: string[] = [];
+
+  // both can be done with a single loop:
+  contacts.forEach((contact) => {
+    contact.attributes.forEach((attr) => {
+      if (attr.attributeKey.key === "userId") {
+        userIdsInContacts.push(attr.value);
+      }
+
+      if (!attributeKeysSet.has(attr.attributeKey.key)) {
+        attributeKeys.push(attr.attributeKey.key);
+      }
+
+      // Add the attribute key to the set
+      attributeKeysSet.add(attr.attributeKey.key);
+    });
+  });
+
+  const [existingUserIds, existingContactsByEmail, existingAttributeKeys] = await Promise.all([
+    prisma.contactAttribute.findMany({
+      where: {
+        attributeKey: {
+          environmentId,
+          key: "userId",
+        },
+        value: {
+          in: userIdsInContacts,
+        },
+      },
+      select: {
+        value: true,
+      },
+    }),
+
+    prisma.contact.findMany({
+      where: {
+        environmentId,
+        attributes: {
+          some: {
+            attributeKey: { key: emailAttributeKey },
+            value: { in: parsedEmails },
+          },
+        },
+      },
+      select: {
+        attributes: {
+          select: {
+            attributeKey: { select: { key: true } },
+            createdAt: true,
+            id: true,
+            value: true,
+          },
+        },
+        id: true,
+      },
+    }),
+
+    prisma.contactAttributeKey.findMany({
+      where: {
+        key: { in: attributeKeys },
+        environmentId,
+      },
+    }),
+  ]);
+
+  // Build a map from email to contact id (if the email attribute exists)
+  const contactMap = new Map<
+    string,
+    {
+      contactId: string;
+      attributes: { id: string; attributeKey: { key: string }; createdAt: Date; value: string }[];
+    }
+  >();
+
+  existingContactsByEmail.forEach((contact) => {
+    const emailAttr = contact.attributes.find((attr) => attr.attributeKey.key === emailAttributeKey);
+
+    if (emailAttr) {
+      contactMap.set(emailAttr.value, {
+        contactId: contact.id,
+        attributes: contact.attributes.map((attr) => ({
+          id: attr.id,
+          attributeKey: { key: attr.attributeKey.key },
+          createdAt: attr.createdAt,
+          value: attr.value,
+        })),
+      });
+    }
+  });
+
+  // Split contacts into ones to update and ones to create
+  const contactsToUpdate: {
+    contactId: string;
+    attributes: {
+      id: string;
+      createdAt: Date;
+      value: string;
+      attributeKey: {
+        key: string;
+      };
+    }[];
+  }[] = [];
+
+  const contactsToCreate: {
+    attributes: {
+      value: string;
+      attributeKey: {
+        key: string;
+      };
+    }[];
+  }[] = [];
+
+  let filteredContacts: TContactBulkUploadContact[] = [];
+
+  contacts.forEach((contact, idx) => {
+    const emailAttr = contact.attributes.find((attr) => attr.attributeKey.key === emailAttributeKey);
+
+    if (emailAttr && contactMap.has(emailAttr.value)) {
+      // if all the attributes passed are the same as the existing attributes, skip the update:
+      const existingContact = contactMap.get(emailAttr.value);
+      if (existingContact) {
+        // Create maps of existing attributes by key
+        const existingAttributesByKey = new Map(
+          existingContact.attributes.map((attr) => [attr.attributeKey.key, attr.value])
+        );
+
+        // Determine which attributes need updating by comparing values.
+        const attributesToUpdate = contact.attributes.filter(
+          (attr) => existingAttributesByKey.get(attr.attributeKey.key) !== attr.value
+        );
+
+        // Check if any attributes need updating
+        const needsUpdate = attributesToUpdate.length > 0;
+
+        if (!needsUpdate) {
+          filteredContacts.push(contact);
+          // No attributes need to be updated
+          return;
+        }
+
+        // if the attributes to update have a userId that exists in the db, we need to skip the update
+        const userIdAttr = attributesToUpdate.find((attr) => attr.attributeKey.key === "userId");
+
+        if (userIdAttr) {
+          const existingUserId = existingUserIds.find(
+            (existingUserId) => existingUserId.value === userIdAttr.value
+          );
+
+          if (existingUserId) {
+            contactIdxWithConflictingUserIds.push(idx);
+            return;
+          }
+        }
+
+        filteredContacts.push(contact);
+        contactsToUpdate.push({
+          contactId: existingContact.contactId,
+          attributes: attributesToUpdate.map((attr) => {
+            const existingAttr = existingContact.attributes.find(
+              (a) => a.attributeKey.key === attr.attributeKey.key
+            );
+
+            if (!existingAttr) {
+              return {
+                id: createId(),
+                createdAt: new Date(),
+                value: attr.value,
+                attributeKey: attr.attributeKey,
+              };
+            }
+
+            return {
+              id: existingAttr.id,
+              createdAt: existingAttr.createdAt,
+              value: attr.value,
+              attributeKey: attr.attributeKey,
+            };
+          }),
+        });
+      }
+    } else {
+      // There can't be a case where the emailAttr is not defined since that should be caught by zod.
+
+      // if the contact has a userId that already exists in the db, we need to skip the create
+      const userIdAttr = contact.attributes.find((attr) => attr.attributeKey.key === "userId");
+      if (userIdAttr) {
+        const existingUserId = existingUserIds.find(
+          (existingUserId) => existingUserId.value === userIdAttr.value
+        );
+
+        if (existingUserId) {
+          contactIdxWithConflictingUserIds.push(idx);
+          return;
+        }
+      }
+
+      filteredContacts.push(contact);
+      contactsToCreate.push(contact);
+    }
+  });
+
+  try {
+    // Execute everything in ONE transaction
+    await prisma.$transaction(async (tx) => {
+      const attributeKeyMap = existingAttributeKeys.reduce<Record<string, string>>((acc, keyObj) => {
+        acc[keyObj.key] = keyObj.id;
+        return acc;
+      }, {});
+
+      // Check for missing attribute keys and create them if needed.
+      const missingKeysMap = new Map<string, { key: string; name: string }>();
+      const attributeKeyNameUpdates = new Map<string, { key: string; name: string }>();
+
+      for (const contact of filteredContacts) {
+        for (const attr of contact.attributes) {
+          if (!attributeKeyMap[attr.attributeKey.key]) {
+            missingKeysMap.set(attr.attributeKey.key, attr.attributeKey);
+          } else {
+            // Check if the name has changed for existing attribute keys
+            const existingKey = existingAttributeKeys.find((ak) => ak.key === attr.attributeKey.key);
+            if (existingKey && existingKey.name !== attr.attributeKey.name) {
+              attributeKeyNameUpdates.set(attr.attributeKey.key, attr.attributeKey);
+            }
+          }
+        }
+      }
+
+      // Handle both missing keys and name updates in a single batch operation
+      const keysToUpsert = new Map<string, { key: string; name: string }>();
+
+      // Collect all keys that need to be created or updated
+      for (const [key, value] of missingKeysMap) {
+        keysToUpsert.set(key, value);
+      }
+
+      for (const [key, value] of attributeKeyNameUpdates) {
+        keysToUpsert.set(key, value);
+      }
+
+      if (keysToUpsert.size > 0) {
+        const keysArray = Array.from(keysToUpsert.values());
+        const BATCH_SIZE = 10000;
+
+        for (let i = 0; i < keysArray.length; i += BATCH_SIZE) {
+          const batch = keysArray.slice(i, i + BATCH_SIZE);
+
+          // Use raw query to perform upsert
+          const upsertedKeys = await tx.$queryRaw<{ id: string; key: string }[]>`
+            INSERT INTO "ContactAttributeKey" ("id", "key", "name", "environmentId", "created_at", "updated_at")
+            SELECT 
+              unnest(${Prisma.sql`ARRAY[${batch.map(() => createId())}]`}),
+              unnest(${Prisma.sql`ARRAY[${batch.map((k) => k.key)}]`}),
+              unnest(${Prisma.sql`ARRAY[${batch.map((k) => k.name)}]`}),
+              ${environmentId},
+              NOW(),
+              NOW()
+            ON CONFLICT ("key", "environmentId") 
+            DO UPDATE SET 
+              "name" = EXCLUDED."name",
+              "updated_at" = NOW()
+            RETURNING "id", "key"
+          `;
+
+          // Update attribute key map with upserted keys
+          for (const key of upsertedKeys) {
+            attributeKeyMap[key.key] = key.id;
+          }
+        }
+      }
+
+      // Create new contacts -- should be at most 1000, no need to batch
+      const newContacts = contactsToCreate.map(() => ({
+        id: createId(),
+        environmentId,
+      }));
+
+      if (newContacts.length > 0) {
+        await tx.contact.createMany({
+          data: newContacts,
+        });
+      }
+
+      // Prepare attributes for both new and existing contacts
+      const attributesUpsertForCreatedUsers = contactsToCreate.flatMap((contact, idx) =>
+        contact.attributes.map((attr) => ({
+          id: createId(),
+          contactId: newContacts[idx].id,
+          attributeKeyId: attributeKeyMap[attr.attributeKey.key],
+          value: attr.value,
+          createdAt: new Date(),
+          updatedAt: new Date(),
+        }))
+      );
+
+      const attributesUpsertForExistingUsers = contactsToUpdate.flatMap((contact) =>
+        contact.attributes.map((attr) => ({
+          id: attr.id,
+          contactId: contact.contactId,
+          attributeKeyId: attributeKeyMap[attr.attributeKey.key],
+          value: attr.value,
+          createdAt: attr.createdAt,
+          updatedAt: new Date(),
+        }))
+      );
+
+      const attributesToUpsert = [...attributesUpsertForCreatedUsers, ...attributesUpsertForExistingUsers];
+
+      // Skip the raw query if there are no attributes to upsert
+      if (attributesToUpsert.length > 0) {
+        // Process attributes in batches of 10,000
+        const BATCH_SIZE = 10000;
+        for (let i = 0; i < attributesToUpsert.length; i += BATCH_SIZE) {
+          const batch = attributesToUpsert.slice(i, i + BATCH_SIZE);
+
+          // Use a raw query to perform a bulk insert with an ON CONFLICT clause
+          await tx.$executeRaw`
+            INSERT INTO "ContactAttribute" (
+              "id", "created_at", "updated_at", "contactId", "value", "attributeKeyId"
+            )
+            SELECT 
+              unnest(${Prisma.sql`ARRAY[${batch.map((a) => a.id)}]`}),
+              unnest(${Prisma.sql`ARRAY[${batch.map((a) => a.createdAt)}]`}),
+              unnest(${Prisma.sql`ARRAY[${batch.map((a) => a.updatedAt)}]`}),
+              unnest(${Prisma.sql`ARRAY[${batch.map((a) => a.contactId)}]`}),
+              unnest(${Prisma.sql`ARRAY[${batch.map((a) => a.value)}]`}),
+              unnest(${Prisma.sql`ARRAY[${batch.map((a) => a.attributeKeyId)}]`})
+            ON CONFLICT ("contactId", "attributeKeyId") DO UPDATE SET
+              "value" = EXCLUDED."value",
+              "updated_at" = EXCLUDED."updated_at"
+          `;
+        }
+      }
+
+      contactCache.revalidate({
+        environmentId,
+      });
+
+      // revalidate all the new contacts:
+      for (const newContact of newContacts) {
+        contactCache.revalidate({
+          id: newContact.id,
+        });
+      }
+
+      // revalidate all the existing contacts:
+      for (const existingContact of existingContactsByEmail) {
+        contactCache.revalidate({
+          id: existingContact.id,
+        });
+      }
+
+      contactAttributeKeyCache.revalidate({
+        environmentId,
+      });
+
+      contactAttributeCache.revalidate({ environmentId });
+    });
+
+    return ok({
+      contactIdxWithConflictingUserIds,
+    });
+  } catch (error) {
+    logger.error({ error }, "Failed to upsert contacts");
+
+    return err({
+      type: "internal_server_error",
+      details: [{ field: "error", issue: "Failed to upsert contacts" }],
+    });
+  }
+};
diff --git a/apps/web/modules/ee/contacts/api/v2/management/contacts/bulk/lib/openapi.ts b/apps/web/modules/ee/contacts/api/v2/management/contacts/bulk/lib/openapi.ts
new file mode 100644
index 0000000000..5535be7568
--- /dev/null
+++ b/apps/web/modules/ee/contacts/api/v2/management/contacts/bulk/lib/openapi.ts
@@ -0,0 +1,59 @@
+import { ZContactBulkUploadRequest } from "@/modules/ee/contacts/types/contact";
+import { z } from "zod";
+import { ZodOpenApiOperationObject, ZodOpenApiPathsObject } from "zod-openapi";
+
+const bulkContactEndpoint: ZodOpenApiOperationObject = {
+  operationId: "uploadBulkContacts",
+  summary: "Upload Bulk Contacts",
+  description: "Uploads contacts in bulk",
+  requestBody: {
+    required: true,
+    description: "The contacts to upload",
+    content: {
+      "application/json": {
+        schema: ZContactBulkUploadRequest,
+      },
+    },
+  },
+  tags: ["Management API > Contacts"],
+  responses: {
+    "200": {
+      description: "Contacts uploaded successfully.",
+      content: {
+        "application/json": {
+          schema: z.object({
+            data: z.object({
+              status: z.string(),
+              message: z.string(),
+            }),
+          }),
+        },
+      },
+    },
+    "207": {
+      description: "Contacts uploaded partially successfully.",
+      content: {
+        "application/json": {
+          schema: z.object({
+            data: z.object({
+              status: z.string(),
+              message: z.string(),
+              skippedContacts: z.array(
+                z.object({
+                  index: z.number(),
+                  userId: z.string(),
+                })
+              ),
+            }),
+          }),
+        },
+      },
+    },
+  },
+};
+
+export const bulkContactPaths: ZodOpenApiPathsObject = {
+  "/contacts/bulk": {
+    put: bulkContactEndpoint,
+  },
+};
diff --git a/apps/web/modules/ee/contacts/api/v2/management/contacts/bulk/lib/tests/contact.test.ts b/apps/web/modules/ee/contacts/api/v2/management/contacts/bulk/lib/tests/contact.test.ts
new file mode 100644
index 0000000000..0017b21e56
--- /dev/null
+++ b/apps/web/modules/ee/contacts/api/v2/management/contacts/bulk/lib/tests/contact.test.ts
@@ -0,0 +1,476 @@
+import { contactCache } from "@/lib/cache/contact";
+import { contactAttributeCache } from "@/lib/cache/contact-attribute";
+import { contactAttributeKeyCache } from "@/lib/cache/contact-attribute-key";
+import { upsertBulkContacts } from "@/modules/ee/contacts/api/v2/management/contacts/bulk/lib/contact";
+import { beforeEach, describe, expect, test, vi } from "vitest";
+import { prisma } from "@formbricks/database";
+
+// Ensure that createId always returns "mock-id" for predictability
+vi.mock("@paralleldrive/cuid2", () => ({
+  createId: vi.fn(() => "mock-id"),
+}));
+
+// Mock prisma methods
+vi.mock("@formbricks/database", () => ({
+  prisma: {
+    contactAttribute: {
+      findMany: vi.fn(),
+    },
+    contactAttributeKey: {
+      findMany: vi.fn(),
+      createManyAndReturn: vi.fn(),
+    },
+    contact: {
+      findMany: vi.fn(),
+      createMany: vi.fn(),
+    },
+    $transaction: vi.fn((callback) => callback(prisma)),
+    $executeRaw: vi.fn(),
+    $queryRaw: vi.fn(),
+  },
+}));
+
+// Mock cache functions
+vi.mock("@/lib/cache/contact", () => ({
+  contactCache: {
+    revalidate: vi.fn(),
+    tag: {
+      byId: (id: string) => `contacts-${id}`,
+      byEnvironmentId: (environmentId: string) => `environments-${environmentId}-contacts`,
+    },
+  },
+}));
+
+vi.mock("@/lib/cache/contact-attribute", () => ({
+  contactAttributeCache: {
+    revalidate: vi.fn(),
+    tag: {
+      byEnvironmentId: (environmentId: string) => `contactAttributes-${environmentId}`,
+    },
+  },
+}));
+
+vi.mock("@/lib/cache/contact-attribute-key", () => ({
+  contactAttributeKeyCache: {
+    revalidate: vi.fn(),
+    tag: {
+      byEnvironmentId: (environmentId: string) => `environments-${environmentId}-contactAttributeKeys`,
+    },
+  },
+}));
+
+describe("upsertBulkContacts", () => {
+  const mockEnvironmentId = "env_123";
+
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  test("should create new contacts when all provided contacts have unique user IDs and emails", async () => {
+    // Mock data: two contacts with unique userId and email
+    const mockContacts = [
+      {
+        attributes: [
+          { attributeKey: { key: "email", name: "Email" }, value: "john@example.com" },
+          { attributeKey: { key: "userId", name: "User ID" }, value: "user-123" },
+          { attributeKey: { key: "name", name: "Name" }, value: "John Doe" },
+        ],
+      },
+      {
+        attributes: [
+          { attributeKey: { key: "email", name: "Email" }, value: "jane@example.com" },
+          { attributeKey: { key: "userId", name: "User ID" }, value: "user-456" },
+          { attributeKey: { key: "name", name: "Name" }, value: "Jane Smith" },
+        ],
+      },
+    ];
+
+    const mockParsedEmails = ["john@example.com", "jane@example.com"];
+
+    // Mock: no existing userIds in DB
+    vi.mocked(prisma.contactAttribute.findMany).mockResolvedValueOnce([]);
+    // Mock: all attribute keys already exist
+    const mockAttributeKeys = [
+      { id: "attr-key-email", key: "email", environmentId: mockEnvironmentId, name: "Email" },
+      { id: "attr-key-userId", key: "userId", environmentId: mockEnvironmentId, name: "User ID" },
+      { id: "attr-key-name", key: "name", environmentId: mockEnvironmentId, name: "Name" },
+    ];
+    vi.mocked(prisma.contactAttributeKey.findMany).mockResolvedValueOnce(mockAttributeKeys);
+    // Mock: no existing contacts by email
+    vi.mocked(prisma.contact.findMany).mockResolvedValueOnce([]);
+
+    // Execute the function
+    const result = await upsertBulkContacts(mockContacts, mockEnvironmentId, mockParsedEmails);
+
+    // Assert that the result is ok and data is as expected
+    if (!result.ok) throw new Error("Expected result.ok to be true");
+    expect(result.data).toEqual({ contactIdxWithConflictingUserIds: [] });
+
+    // Verify that existing user IDs were checked
+    expect(prisma.contactAttribute.findMany).toHaveBeenCalledWith({
+      where: {
+        attributeKey: {
+          environmentId: mockEnvironmentId,
+          key: "userId",
+        },
+        value: {
+          in: ["user-123", "user-456"],
+        },
+      },
+      select: { value: true },
+    });
+
+    // Verify that attribute keys were fetched
+    expect(prisma.contactAttributeKey.findMany).toHaveBeenCalledWith({
+      where: {
+        key: { in: ["email", "userId", "name"] },
+        environmentId: mockEnvironmentId,
+      },
+    });
+
+    // Verify that existing contacts were looked up by email
+    expect(prisma.contact.findMany).toHaveBeenCalledWith({
+      where: {
+        environmentId: mockEnvironmentId,
+        attributes: {
+          some: {
+            attributeKey: { key: "email" },
+            value: { in: mockParsedEmails },
+          },
+        },
+      },
+      select: {
+        attributes: {
+          select: {
+            attributeKey: { select: { key: true } },
+            createdAt: true,
+            id: true,
+            value: true,
+          },
+        },
+        id: true,
+      },
+    });
+
+    // Verify that new contacts were created in the transaction
+    expect(prisma.contact.createMany).toHaveBeenCalledWith({
+      data: [
+        { id: "mock-id", environmentId: mockEnvironmentId },
+        { id: "mock-id", environmentId: mockEnvironmentId },
+      ],
+    });
+
+    // Verify that the raw SQL query was executed to upsert attributes
+    expect(prisma.$executeRaw).toHaveBeenCalled();
+
+    // Verify that caches were revalidated
+    expect(contactCache.revalidate).toHaveBeenCalledWith({ environmentId: mockEnvironmentId });
+    // Since two new contacts are created with same id "mock-id", expect at least one revalidation with id "mock-id"
+    expect(contactCache.revalidate).toHaveBeenCalledWith({ id: "mock-id" });
+    expect(contactAttributeKeyCache.revalidate).toHaveBeenCalledWith({ environmentId: mockEnvironmentId });
+    expect(contactAttributeCache.revalidate).toHaveBeenCalledWith({ environmentId: mockEnvironmentId });
+  });
+
+  test("should update existing contacts when provided contacts match an existing email", async () => {
+    // Mock data: a contact that exists in the DB
+    const mockContacts = [
+      {
+        attributes: [
+          { attributeKey: { key: "email", name: "Email" }, value: "john@example.com" },
+          // No userId is provided so it should be treated as update
+        ],
+      },
+    ];
+
+    const mockParsedEmails = ["john@example.com"];
+
+    // Mock: no existing userIds conflict
+    vi.mocked(prisma.contactAttribute.findMany).mockResolvedValueOnce([]);
+    // Mock: attribute keys for email exist
+    const mockAttributeKeys = [
+      { id: "attr-key-email", key: "email", environmentId: mockEnvironmentId, name: "Email" },
+    ];
+    vi.mocked(prisma.contactAttributeKey.findMany).mockResolvedValueOnce(mockAttributeKeys);
+    // Mock: an existing contact with the same email
+    vi.mocked(prisma.contact.findMany).mockResolvedValueOnce([
+      {
+        id: "existing-contact-id",
+        attributes: [
+          {
+            id: "existing-email-attr",
+            attributeKey: { key: "email", name: "Email" },
+            value: "john@example.com",
+            createdAt: new Date("2023-01-01"),
+          },
+        ],
+      },
+    ]);
+
+    // Execute the function
+    const result = await upsertBulkContacts(mockContacts, mockEnvironmentId, mockParsedEmails);
+
+    if (!result.ok) throw new Error("Expected result.ok to be true");
+    expect(result.data).toEqual({ contactIdxWithConflictingUserIds: [] });
+  });
+
+  test("should return the indices of contacts with conflicting user IDs", async () => {
+    // Mock data - mix of valid and conflicting contacts
+    const mockContacts = [
+      {
+        // Contact 0: Valid contact with unique userId
+        attributes: [
+          { attributeKey: { key: "email", name: "Email" }, value: "john@example.com" },
+          { attributeKey: { key: "userId", name: "User ID" }, value: "user-123" },
+          { attributeKey: { key: "name", name: "Name" }, value: "John Doe" },
+        ],
+      },
+      {
+        // Contact 1: Conflicting contact (userId already exists)
+        attributes: [
+          { attributeKey: { key: "email", name: "Email" }, value: "jane@example.com" },
+          { attributeKey: { key: "userId", name: "User ID" }, value: "existing-user-1" },
+          { attributeKey: { key: "name", name: "Name" }, value: "Jane Smith" },
+        ],
+      },
+      {
+        // Contact 2: Valid contact with no userId
+        attributes: [
+          { attributeKey: { key: "email", name: "Email" }, value: "bob@example.com" },
+          { attributeKey: { key: "name", name: "Name" }, value: "Bob Johnson" },
+        ],
+      },
+      {
+        // Contact 3: Conflicting contact (userId already exists)
+        attributes: [
+          { attributeKey: { key: "email", name: "Email" }, value: "alice@example.com" },
+          { attributeKey: { key: "userId", name: "User ID" }, value: "existing-user-2" },
+          { attributeKey: { key: "name", name: "Name" }, value: "Alice Brown" },
+        ],
+      },
+    ];
+
+    const mockParsedEmails = ["john@example.com", "jane@example.com", "bob@example.com", "alice@example.com"];
+
+    // Mock existing user IDs - these will conflict with some of our contacts
+    const mockExistingUserIds = [{ value: "existing-user-1" }, { value: "existing-user-2" }];
+    vi.mocked(prisma.contactAttribute.findMany).mockResolvedValueOnce(mockExistingUserIds);
+
+    // Mock attribute keys
+    const mockAttributeKeys = [
+      { id: "attr-key-email", key: "email", environmentId: mockEnvironmentId },
+      { id: "attr-key-userId", key: "userId", environmentId: mockEnvironmentId },
+      { id: "attr-key-name", key: "name", environmentId: mockEnvironmentId },
+    ];
+    vi.mocked(prisma.contactAttributeKey.findMany).mockResolvedValueOnce(mockAttributeKeys);
+
+    // Mock existing contacts (none for this test case)
+    vi.mocked(prisma.contact.findMany).mockResolvedValueOnce([]);
+
+    // Execute the function
+    const result = await upsertBulkContacts(mockContacts, mockEnvironmentId, mockParsedEmails);
+
+    if (result.ok) {
+      // Assertions - verify that the function correctly identified contacts with conflicting user IDs
+      expect(result.data.contactIdxWithConflictingUserIds).toEqual([1, 3]);
+
+      // Verify that the function checked for existing user IDs
+      expect(prisma.contactAttribute.findMany).toHaveBeenCalledWith({
+        where: {
+          attributeKey: {
+            environmentId: mockEnvironmentId,
+            key: "userId",
+          },
+          value: {
+            in: ["user-123", "existing-user-1", "existing-user-2"],
+          },
+        },
+        select: {
+          value: true,
+        },
+      });
+
+      // Verify that the function fetched attribute keys for the filtered contacts (without conflicting userIds)
+      expect(prisma.contactAttributeKey.findMany).toHaveBeenCalled();
+
+      // Verify that the function checked for existing contacts by email
+      expect(prisma.contact.findMany).toHaveBeenCalledWith({
+        where: {
+          environmentId: mockEnvironmentId,
+          attributes: {
+            some: {
+              attributeKey: { key: "email" },
+              value: { in: mockParsedEmails },
+            },
+          },
+        },
+        select: {
+          attributes: {
+            select: {
+              attributeKey: { select: { key: true } },
+              createdAt: true,
+              id: true,
+              value: true,
+            },
+          },
+          id: true,
+        },
+      });
+
+      // Verify that only non-conflicting contacts were processed
+      expect(prisma.contact.createMany).toHaveBeenCalledWith({
+        data: [
+          { id: "mock-id", environmentId: mockEnvironmentId },
+          { id: "mock-id", environmentId: mockEnvironmentId },
+        ],
+      });
+
+      // Verify that the transaction was executed
+      expect(prisma.$transaction).toHaveBeenCalled();
+
+      // Verify that caches were revalidated
+      expect(contactCache.revalidate).toHaveBeenCalledWith({
+        environmentId: mockEnvironmentId,
+      });
+      expect(contactAttributeKeyCache.revalidate).toHaveBeenCalledWith({
+        environmentId: mockEnvironmentId,
+      });
+      expect(contactAttributeCache.revalidate).toHaveBeenCalledWith({
+        environmentId: mockEnvironmentId,
+      });
+    }
+  });
+
+  test("should create missing attribute keys when they are not found in the database", async () => {
+    // Mock data: contacts with attributes that include missing attribute keys
+    const mockContacts = [
+      {
+        attributes: [
+          { attributeKey: { key: "email", name: "Email" }, value: "john@example.com" },
+          { attributeKey: { key: "newKey1", name: "New Key 1" }, value: "value1" },
+        ],
+      },
+      {
+        attributes: [
+          { attributeKey: { key: "email", name: "Email" }, value: "jane@example.com" },
+          { attributeKey: { key: "newKey2", name: "New Key 2" }, value: "value2" },
+        ],
+      },
+    ];
+    const mockParsedEmails = ["john@example.com", "jane@example.com"];
+
+    // Mock: no existing user IDs
+    vi.mocked(prisma.contactAttribute.findMany).mockResolvedValueOnce([]);
+    // Mock: only "email" exists; new keys are missing
+    const mockAttributeKeys = [
+      { id: "attr-key-email", key: "email", environmentId: mockEnvironmentId, name: "Email" },
+      { id: "attr-key-newKey1", key: "newKey1", environmentId: mockEnvironmentId, name: "New Key 1" },
+      { id: "attr-key-newKey2", key: "newKey2", environmentId: mockEnvironmentId, name: "New Key 2" },
+    ];
+
+    vi.mocked(prisma.contactAttributeKey.findMany).mockResolvedValueOnce(mockAttributeKeys);
+
+    // Mock: no existing contacts for update
+    vi.mocked(prisma.contact.findMany).mockResolvedValueOnce([]);
+
+    // Execute the function
+    const result = await upsertBulkContacts(mockContacts, mockEnvironmentId, mockParsedEmails);
+
+    // creation of new attribute keys now happens with a raw query
+    // so we need to mock that
+    vi.mocked(prisma.$queryRaw).mockResolvedValue([
+      { id: "attr-key-newKey1", key: "newKey1" },
+      { id: "attr-key-newKey2", key: "newKey2" },
+    ]);
+
+    if (!result.ok) throw new Error("Expected result.ok to be true");
+    expect(result.data).toEqual({ contactIdxWithConflictingUserIds: [] });
+
+    // Verify that new contacts were created
+    expect(prisma.contact.createMany).toHaveBeenCalledWith({
+      data: [
+        { id: "mock-id", environmentId: mockEnvironmentId },
+        { id: "mock-id", environmentId: mockEnvironmentId },
+      ],
+    });
+
+    // Verify that the raw SQL query was executed for inserting attributes
+    expect(prisma.$executeRaw).toHaveBeenCalled();
+
+    // Verify that caches were revalidated
+    expect(contactAttributeKeyCache.revalidate).toHaveBeenCalledWith({
+      environmentId: mockEnvironmentId,
+    });
+  });
+
+  test("should update attribute key names when they change", async () => {
+    // Mock data: a contact with an attribute that has a new name for an existing key
+    const mockContacts = [
+      {
+        attributes: [
+          { attributeKey: { key: "email", name: "Email" }, value: "john@example.com" },
+          { attributeKey: { key: "name", name: "Full Name" }, value: "John Doe" }, // Changed name from "Name" to "Full Name"
+        ],
+      },
+    ];
+
+    const mockParsedEmails = ["john@example.com"];
+
+    // Mock: no existing userIds conflict
+    vi.mocked(prisma.contactAttribute.findMany).mockResolvedValueOnce([]);
+
+    // Mock: attribute keys exist but with different names
+    const mockAttributeKeys = [
+      { id: "attr-key-email", key: "email", environmentId: mockEnvironmentId, name: "Email" },
+      { id: "attr-key-name", key: "name", environmentId: mockEnvironmentId, name: "Name" }, // Original name
+    ];
+    vi.mocked(prisma.contactAttributeKey.findMany).mockResolvedValueOnce(mockAttributeKeys);
+
+    // Mock: an existing contact
+    vi.mocked(prisma.contact.findMany).mockResolvedValueOnce([
+      {
+        id: "existing-contact-id",
+        attributes: [
+          {
+            id: "existing-email-attr",
+            attributeKey: { key: "email", name: "Email" },
+            value: "john@example.com",
+            createdAt: new Date("2023-01-01"),
+          },
+          {
+            id: "existing-name-attr",
+            attributeKey: { key: "name", name: "Name" },
+            value: "John Doe",
+            createdAt: new Date("2023-01-01"),
+          },
+        ],
+      },
+    ]);
+
+    // Mock the transaction
+    const mockTransaction = {
+      contact: {
+        createMany: vi.fn().mockResolvedValue({ count: 0 }),
+      },
+      $executeRaw: vi.fn().mockResolvedValue({ count: 0 }),
+      $queryRaw: vi.fn().mockResolvedValue([{ id: "attr-key-name", key: "name", name: "Full Name" }]),
+    };
+
+    vi.mocked(prisma.$transaction).mockImplementationOnce((callback) => {
+      return callback(mockTransaction as any);
+    });
+
+    // Execute the function
+    const result = await upsertBulkContacts(mockContacts, mockEnvironmentId, mockParsedEmails);
+
+    if (!result.ok) throw new Error("Expected result.ok to be true");
+    expect(result.data).toEqual({ contactIdxWithConflictingUserIds: [] });
+
+    // Verify that the raw SQL query was executed for updating attribute keys
+    vi.mocked(prisma.$queryRaw).mockResolvedValue([{ id: "attr-key-name", key: "name", name: "Full Name" }]);
+
+    // Verify that caches were revalidated
+    expect(contactAttributeKeyCache.revalidate).toHaveBeenCalledWith({
+      environmentId: mockEnvironmentId,
+    });
+  });
+});
diff --git a/apps/web/modules/ee/contacts/api/v2/management/contacts/bulk/route.ts b/apps/web/modules/ee/contacts/api/v2/management/contacts/bulk/route.ts
new file mode 100644
index 0000000000..3cd4ea0223
--- /dev/null
+++ b/apps/web/modules/ee/contacts/api/v2/management/contacts/bulk/route.ts
@@ -0,0 +1,61 @@
+import { responses } from "@/modules/api/v2/lib/response";
+import { handleApiError } from "@/modules/api/v2/lib/utils";
+import { authenticatedApiClient } from "@/modules/api/v2/management/auth/authenticated-api-client";
+import { upsertBulkContacts } from "@/modules/ee/contacts/api/v2/management/contacts/bulk/lib/contact";
+import { ZContactBulkUploadRequest } from "@/modules/ee/contacts/types/contact";
+import { getIsContactsEnabled } from "@/modules/ee/license-check/lib/utils";
+
+export const PUT = async (request: Request) =>
+  authenticatedApiClient({
+    request,
+    schemas: {
+      body: ZContactBulkUploadRequest,
+    },
+    handler: async ({ authentication, parsedInput }) => {
+      const isContactsEnabled = await getIsContactsEnabled();
+      if (!isContactsEnabled) {
+        return handleApiError(request, {
+          type: "forbidden",
+          details: [{ field: "error", issue: "Contacts are not enabled for this environment." }],
+        });
+      }
+
+      const { contacts } = parsedInput.body ?? { contacts: [] };
+      const { environmentId } = authentication;
+
+      const emails = contacts.map(
+        (contact) => contact.attributes.find((attr) => attr.attributeKey.key === "email")?.value!
+      );
+
+      const upsertBulkContactsResult = await upsertBulkContacts(contacts, environmentId, emails);
+
+      if (!upsertBulkContactsResult.ok) {
+        return handleApiError(request, upsertBulkContactsResult.error);
+      }
+
+      const { contactIdxWithConflictingUserIds } = upsertBulkContactsResult.data;
+
+      if (contactIdxWithConflictingUserIds.length) {
+        return responses.multiStatusResponse({
+          data: {
+            status: "success",
+            message:
+              "Contacts bulk upload partially successful. Some contacts were skipped due to conflicting userIds.",
+            meta: {
+              skippedContacts: contactIdxWithConflictingUserIds.map((idx) => ({
+                index: idx,
+                userId: contacts[idx].attributes.find((attr) => attr.attributeKey.key === "userId")?.value,
+              })),
+            },
+          },
+        });
+      }
+
+      return responses.successResponse({
+        data: {
+          status: "success",
+          message: "Contacts bulk upload successful",
+        },
+      });
+    },
+  });
diff --git a/apps/web/modules/ee/contacts/types/contact.ts b/apps/web/modules/ee/contacts/types/contact.ts
index ce32736fd6..64c5b2ae5b 100644
--- a/apps/web/modules/ee/contacts/types/contact.ts
+++ b/apps/web/modules/ee/contacts/types/contact.ts
@@ -107,3 +107,138 @@ export const ZContactCSVAttributeMap = z.record(z.string(), z.string()).superRef
   }
 });
 export type TContactCSVAttributeMap = z.infer<typeof ZContactCSVAttributeMap>;
+
+export const ZContactBulkUploadAttribute = z.object({
+  attributeKey: z.object({
+    key: z.string(),
+    name: z.string(),
+  }),
+  value: z.string(),
+});
+
+export const ZContactBulkUploadContact = z.object({
+  attributes: z.array(ZContactBulkUploadAttribute),
+});
+
+export type TContactBulkUploadContact = z.infer<typeof ZContactBulkUploadContact>;
+
+export const ZContactBulkUploadRequest = z.object({
+  contacts: z
+    .array(ZContactBulkUploadContact)
+    .max(1000, { message: "Maximum 1000 contacts allowed at a time." })
+    .superRefine((contacts, ctx) => {
+      // Track all data in a single pass
+      const seenEmails = new Set<string>();
+      const duplicateEmails = new Set<string>();
+      const seenUserIds = new Set<string>();
+      const duplicateUserIds = new Set<string>();
+      const contactsWithDuplicateKeys: { idx: number; duplicateKeys: string[] }[] = [];
+
+      // Process each contact in a single pass
+      contacts.forEach((contact, idx) => {
+        // 1. Check email existence and validity
+        const emailAttr = contact.attributes.find((attr) => attr.attributeKey.key === "email");
+        if (!emailAttr?.value) {
+          ctx.addIssue({
+            code: z.ZodIssueCode.custom,
+            message: `Missing email attribute for contact at index ${idx}`,
+          });
+        } else {
+          // Check email format
+          const parsedEmail = z.string().email().safeParse(emailAttr.value);
+          if (!parsedEmail.success) {
+            ctx.addIssue({
+              code: z.ZodIssueCode.custom,
+              message: `Invalid email for contact at index ${idx}`,
+            });
+          }
+
+          // Check for duplicate emails
+          if (seenEmails.has(emailAttr.value)) {
+            duplicateEmails.add(emailAttr.value);
+          } else {
+            seenEmails.add(emailAttr.value);
+          }
+        }
+
+        // 2. Check for userId duplicates
+        const userIdAttr = contact.attributes.find((attr) => attr.attributeKey.key === "userId");
+        if (userIdAttr?.value) {
+          if (seenUserIds.has(userIdAttr.value)) {
+            duplicateUserIds.add(userIdAttr.value);
+          } else {
+            seenUserIds.add(userIdAttr.value);
+          }
+        }
+
+        // 3. Check for duplicate attribute keys within the same contact
+        const keyOccurrences = new Map<string, number>();
+        const duplicateKeysForContact: string[] = [];
+
+        contact.attributes.forEach((attr) => {
+          const key = attr.attributeKey.key;
+          const count = (keyOccurrences.get(key) || 0) + 1;
+          keyOccurrences.set(key, count);
+
+          // If this is the second occurrence, add to duplicates
+          if (count === 2) {
+            duplicateKeysForContact.push(key);
+          }
+        });
+
+        if (duplicateKeysForContact.length > 0) {
+          contactsWithDuplicateKeys.push({ idx, duplicateKeys: duplicateKeysForContact });
+        }
+      });
+
+      // Report all validation issues after the single pass
+      if (duplicateEmails.size > 0) {
+        ctx.addIssue({
+          code: z.ZodIssueCode.custom,
+          message: "Duplicate emails found in the records, please ensure each email is unique.",
+          params: {
+            duplicateEmails: Array.from(duplicateEmails),
+          },
+        });
+      }
+
+      if (duplicateUserIds.size > 0) {
+        ctx.addIssue({
+          code: z.ZodIssueCode.custom,
+          message: "Duplicate userIds found in the records, please ensure each userId is unique.",
+          params: {
+            duplicateUserIds: Array.from(duplicateUserIds),
+          },
+        });
+      }
+
+      if (contactsWithDuplicateKeys.length > 0) {
+        ctx.addIssue({
+          code: z.ZodIssueCode.custom,
+          message:
+            "Duplicate attribute keys found in the records, please ensure each attribute key is unique.",
+          params: {
+            contactsWithDuplicateKeys,
+          },
+        });
+      }
+    }),
+});
+
+export type TContactBulkUploadRequest = z.infer<typeof ZContactBulkUploadRequest>;
+
+export type TContactBulkUploadResponseBase = {
+  status: "success" | "error";
+  message: string;
+};
+
+export type TContactBulkUploadResponseError = TContactBulkUploadResponseBase & {
+  status: "error";
+  message: string;
+  errors: Record<string, string>[];
+};
+
+export type TContactBulkUploadResponseSuccess = TContactBulkUploadResponseBase & {
+  processed: number;
+  failed: number;
+};
diff --git a/apps/web/vite.config.mts b/apps/web/vite.config.mts
index 38b8557e90..8800bff259 100644
--- a/apps/web/vite.config.mts
+++ b/apps/web/vite.config.mts
@@ -1,6 +1,6 @@
 // vitest.config.ts
 import react from "@vitejs/plugin-react";
-import { loadEnv } from "vite";
+import { PluginOption, loadEnv } from "vite";
 import tsconfigPaths from "vite-tsconfig-paths";
 import { defineConfig } from "vitest/config";
 
@@ -47,6 +47,7 @@ export default defineConfig({
         "modules/survey/lib/client-utils.ts",
         "modules/survey/list/components/survey-card.tsx",
         "modules/survey/list/components/survey-dropdown-menu.tsx",
+        "modules/ee/contacts/api/v2/management/contacts/bulk/lib/contact.ts",
       ],
       exclude: [
         "**/.next/**",
@@ -59,5 +60,5 @@ export default defineConfig({
       ],
     },
   },
-  plugins: [tsconfigPaths(), react()],
+  plugins: [tsconfigPaths(), react() as PluginOption],
 });