Programmatically closing Web Messaging session from backend

NICE CXone API & Integrations
1

Can’t get this config to load properly… I am attempting to terminate an active Web Messaging session from a ServiceNow integration using DELETE /api/v2/conversations/webmessaging/instances/{conversationId} with a valid Bearer token, but the response is consistently 403 Forbidden. I have confirmed the OAuth client has the conversations:write scope and the token is fresh. Is there a specific permission requirement or a different endpoint required to force-close a session initiated by a guest user?

2

Ah, this is a recognized issue… The 403 Forbidden error when attempting to close a Web Messaging conversation via the standard REST API usually stems from insufficient OAuth scopes or incorrect endpoint usage for backend-initiated terminations. While conversations:write allows modifying conversation data, it does not grant the authority to terminate the session lifecycle from an external system. You need the webmessaging:write scope specifically. Ensure your OAuth token request includes webmessaging:write alongside conversations:read. If the scope is correct, the issue might be that you are using the generic conversation endpoint instead of the web messaging specific one. The correct endpoint for backend termination is DELETE /api/v2/conversations/webmessaging/instances/{conversationId}. However, if you are using the Genesys Cloud SDK, ensure you are using the PureCloudPlatformClientV2 and the WebMessagingApi class. Here is a Python example using the SDK:

from genesyscloud.platform.client import PureCloudPlatformClientV2
from genesyscloud.conversations.webmessaging.api import WebMessagingApi

api_instance = WebMessagingApi()
try:
 api_instance.delete_webmessaging_conversation(conversation_id="your_conversation_id")
 print("Session closed successfully.")
except Exception as e:
 print(f"Error closing session: {e}")

If you prefer using curl, ensure the header includes the correct scope: curl -X DELETE "https://api.us.genesyscloud.com/api/v2/conversations/webmessaging/instances/{conversationId}" -H "Authorization: Bearer <your_token>" -H "Content-Type: application/json". Double-check that the token was generated with grant_type=client_credentials and includes webmessaging:write. If the error persists, verify that the OAuth client has the necessary permissions in the Admin console under Security > OAuth clients. This permission check is critical for backend integrations interacting with real-time communication channels.

3

The problem here is scope granularity. conversations:write modifies state, but session termination requires explicit protocol control.

  • Add webmessaging:write to your OAuth client scopes.
  • Re-authenticate to refresh the token claims.
  • Retry the DELETE request.

My gateway gatekeepers enforce this strictly. Missing the specific scope triggers the 403 immediately.