diff --git a/packages/api/src/Domain/Client/Subscription/SubscriptionApiOperations.ts b/packages/api/src/Domain/Client/Subscription/SubscriptionApiOperations.ts
index 81c3c5cb6..5ec3c1ffe 100644
--- a/packages/api/src/Domain/Client/Subscription/SubscriptionApiOperations.ts
+++ b/packages/api/src/Domain/Client/Subscription/SubscriptionApiOperations.ts
@@ -2,4 +2,5 @@ export enum SubscriptionApiOperations {
   Inviting,
   CancelingInvite,
   ListingInvites,
+  AcceptingInvite,
 }
diff --git a/packages/api/src/Domain/Client/Subscription/SubscriptionApiService.spec.ts b/packages/api/src/Domain/Client/Subscription/SubscriptionApiService.spec.ts
index 82a718bef..08127ec27 100644
--- a/packages/api/src/Domain/Client/Subscription/SubscriptionApiService.spec.ts
+++ b/packages/api/src/Domain/Client/Subscription/SubscriptionApiService.spec.ts
@@ -1,5 +1,6 @@
 import { Invitation } from '@standardnotes/models'
 
+import { SubscriptionInviteAcceptResponse } from '../../Response/Subscription/SubscriptionInviteAcceptResponse'
 import { SubscriptionInviteCancelResponse } from '../../Response/Subscription/SubscriptionInviteCancelResponse'
 import { SubscriptionInviteListResponse } from '../../Response/Subscription/SubscriptionInviteListResponse'
 import { SubscriptionInviteResponse } from '../../Response/Subscription/SubscriptionInviteResponse'
@@ -24,6 +25,9 @@ describe('SubscriptionApiService', () => {
     subscriptionServer.listInvites = jest.fn().mockReturnValue({
       data: { invitations: [{} as jest.Mocked<Invitation>] },
     } as jest.Mocked<SubscriptionInviteListResponse>)
+    subscriptionServer.acceptInvite = jest.fn().mockReturnValue({
+      data: { success: true },
+    } as jest.Mocked<SubscriptionInviteAcceptResponse>)
   })
 
   it('should invite a user', async () => {
@@ -160,4 +164,48 @@ describe('SubscriptionApiService', () => {
 
     expect(error).not.toBeNull()
   })
+
+  it('should accept an invite', async () => {
+    const response = await createService().acceptInvite('1-2-3')
+
+    expect(response).toEqual({
+      data: {
+        success: true,
+      },
+    })
+    expect(subscriptionServer.acceptInvite).toHaveBeenCalledWith({
+      inviteUuid: '1-2-3',
+    })
+  })
+
+  it('should not accept an invite if it is already accepting', async () => {
+    const service = createService()
+    Object.defineProperty(service, 'operationsInProgress', {
+      get: () => new Map([[SubscriptionApiOperations.AcceptingInvite, true]]),
+    })
+
+    let error = null
+    try {
+      await service.acceptInvite('1-2-3')
+    } catch (caughtError) {
+      error = caughtError
+    }
+
+    expect(error).not.toBeNull()
+  })
+
+  it('should not accept an invite if the server fails', async () => {
+    subscriptionServer.acceptInvite = jest.fn().mockImplementation(() => {
+      throw new Error('Oops')
+    })
+
+    let error = null
+    try {
+      await createService().acceptInvite('1-2-3')
+    } catch (caughtError) {
+      error = caughtError
+    }
+
+    expect(error).not.toBeNull()
+  })
 })
diff --git a/packages/api/src/Domain/Client/Subscription/SubscriptionApiService.ts b/packages/api/src/Domain/Client/Subscription/SubscriptionApiService.ts
index 8e48970f7..4a71cec1e 100644
--- a/packages/api/src/Domain/Client/Subscription/SubscriptionApiService.ts
+++ b/packages/api/src/Domain/Client/Subscription/SubscriptionApiService.ts
@@ -6,9 +6,11 @@ import { SubscriptionServerInterface } from '../../Server/Subscription/Subscript
 import { SubscriptionInviteResponse } from '../../Response/Subscription/SubscriptionInviteResponse'
 import { SubscriptionInviteListResponse } from '../../Response/Subscription/SubscriptionInviteListResponse'
 import { SubscriptionInviteCancelResponse } from '../../Response/Subscription/SubscriptionInviteCancelResponse'
+import { SubscriptionInviteAcceptResponse } from '../../Response/Subscription/SubscriptionInviteAcceptResponse'
 
 import { SubscriptionApiServiceInterface } from './SubscriptionApiServiceInterface'
 import { SubscriptionApiOperations } from './SubscriptionApiOperations'
+import { Uuid } from '@standardnotes/common'
 
 export class SubscriptionApiService implements SubscriptionApiServiceInterface {
   private operationsInProgress: Map<SubscriptionApiOperations, boolean>
@@ -78,4 +80,24 @@ export class SubscriptionApiService implements SubscriptionApiServiceInterface {
       throw new ApiCallError(ErrorMessage.GenericFail)
     }
   }
+
+  async acceptInvite(inviteUuid: Uuid): Promise<SubscriptionInviteAcceptResponse> {
+    if (this.operationsInProgress.get(SubscriptionApiOperations.AcceptingInvite)) {
+      throw new ApiCallError(ErrorMessage.GenericInProgress)
+    }
+
+    this.operationsInProgress.set(SubscriptionApiOperations.AcceptingInvite, true)
+
+    try {
+      const response = await this.subscriptionServer.acceptInvite({
+        inviteUuid,
+      })
+
+      this.operationsInProgress.set(SubscriptionApiOperations.AcceptingInvite, false)
+
+      return response
+    } catch (error) {
+      throw new ApiCallError(ErrorMessage.GenericFail)
+    }
+  }
 }
diff --git a/packages/api/src/Domain/Client/Subscription/SubscriptionApiServiceInterface.ts b/packages/api/src/Domain/Client/Subscription/SubscriptionApiServiceInterface.ts
index e65c2a02f..e3e14875d 100644
--- a/packages/api/src/Domain/Client/Subscription/SubscriptionApiServiceInterface.ts
+++ b/packages/api/src/Domain/Client/Subscription/SubscriptionApiServiceInterface.ts
@@ -1,5 +1,6 @@
 import { Uuid } from '@standardnotes/common'
 
+import { SubscriptionInviteAcceptResponse } from '../../Response/Subscription/SubscriptionInviteAcceptResponse'
 import { SubscriptionInviteCancelResponse } from '../../Response/Subscription/SubscriptionInviteCancelResponse'
 import { SubscriptionInviteListResponse } from '../../Response/Subscription/SubscriptionInviteListResponse'
 import { SubscriptionInviteResponse } from '../../Response/Subscription/SubscriptionInviteResponse'
@@ -8,4 +9,5 @@ export interface SubscriptionApiServiceInterface {
   invite(inviteeEmail: string): Promise<SubscriptionInviteResponse>
   listInvites(): Promise<SubscriptionInviteListResponse>
   cancelInvite(inviteUuid: Uuid): Promise<SubscriptionInviteCancelResponse>
+  acceptInvite(inviteUuid: Uuid): Promise<SubscriptionInviteAcceptResponse>
 }
diff --git a/packages/api/src/Domain/Request/Subscription/SubscriptionInviteAcceptRequestParams.ts b/packages/api/src/Domain/Request/Subscription/SubscriptionInviteAcceptRequestParams.ts
index 975efc490..c72da5b6b 100644
--- a/packages/api/src/Domain/Request/Subscription/SubscriptionInviteAcceptRequestParams.ts
+++ b/packages/api/src/Domain/Request/Subscription/SubscriptionInviteAcceptRequestParams.ts
@@ -1,10 +1,6 @@
 import { Uuid } from '@standardnotes/common'
 
-import { ApiEndpointParam } from '../ApiEndpointParam'
-import { ApiVersion } from '../../Api/ApiVersion'
-
 export type SubscriptionInviteAcceptRequestParams = {
-  [ApiEndpointParam.ApiVersion]: ApiVersion.v0
   inviteUuid: Uuid
   [additionalParam: string]: unknown
 }
diff --git a/packages/api/src/Domain/Response/Subscription/SubscriptionInviteAcceptResponseBody.ts b/packages/api/src/Domain/Response/Subscription/SubscriptionInviteAcceptResponseBody.ts
index 9635a4aec..e5a976440 100644
--- a/packages/api/src/Domain/Response/Subscription/SubscriptionInviteAcceptResponseBody.ts
+++ b/packages/api/src/Domain/Response/Subscription/SubscriptionInviteAcceptResponseBody.ts
@@ -1,3 +1,3 @@
-export type SubscriptionInviteAcceptResponseBody = {
-  success: boolean
-}
+import { Either } from '@standardnotes/common'
+
+export type SubscriptionInviteAcceptResponseBody = Either<{ success: true }, { success: false; message: string }>