diff --git a/source/api/user_api.ts b/source/api/user_api.ts
index a05ef89..de41bba 100644
--- a/source/api/user_api.ts
+++ b/source/api/user_api.ts
@@ -6,6 +6,7 @@ import UserRole from "../models/enums/user_role";
 import ApiInvitation from "../models/api/api_invitation";
 import ApiCreateInvitationForm from "../models/api/api_create_invitation_form";
 import ApiUserPermission from "../models/api/api_user_permission";
+import {AssociationIds} from "../models";
 
 export default class UserApi {
 
@@ -60,6 +61,12 @@ export default class UserApi {
     return Http.post(url, null, {email, token, password}) as unknown as Promise<void>;
   }
 
+  //bulk-invite
+
+  static sendBulkInvites({organizationId}: AssociationIds, tsvContent: string, user: User): Promise<string>  {
+    const url = `${Http.baseUrl()}/users/bulk-invite/${organizationId}`;
+    return Http.postTsvMulipartFormData(url, user, tsvContent) as unknown as Promise<string>;  }
+
 }
 
 makeErrorsPretty(UserApi, {
diff --git a/source/utilities/http.ts b/source/utilities/http.ts
index 1e5d141..16c97e8 100644
--- a/source/utilities/http.ts
+++ b/source/utilities/http.ts
@@ -56,6 +56,19 @@ export default class Http {
     });
   }
 
+  static postTsvMulipartFormData(url: RequestInfo, user: User, tsvContent: string ) {
+    let multipartFormData = new FormData();
+    let file = new Blob([tsvContent], { type: "text/tab-separated-values" });
+    multipartFormData.append("file", file, "file.tsv");
+    return Http.fetch(url, {
+      method: "POST",
+      headers: {
+        ...getAuthorizationHeaders(user)
+      },
+      body: multipartFormData
+    });
+  }
+
   static patch(url: RequestInfo, user: User, body: any) {
     return Http.fetch(url, {
       method: "PATCH",