Is it possible to establish a WebSocket connection for the Guest API using a standard client credentials token? I am building a custom headless messaging client that bypasses the standard Messenger widget. My goal is to send and receive messages programmatically via the /api/v2/conversations/messaging endpoints and the associated WebSocket stream. I have successfully obtained an access token using the client_credentials grant type. The token works perfectly for REST calls to create the conversation and send initial messages. However, the WebSocket handshake fails immediately.
Here is the setup. I generate the token via POST to /oauth/token. I then attempt to connect to the WebSocket endpoint using the token in the query string, similar to the documentation for the widget. The connection attempt returns an HTTP 401 Unauthorized status code during the handshake phase. I have verified the token is active and has the correct scopes for conversation:read and conversation:write. I have also tried passing the token in the Authorization header during the HTTP upgrade request, but the result is identical. The error response body is empty, which is typical for WebSocket handshake failures.
I have checked the event delivery logs and the API usage logs. There are no entries for the WebSocket attempts, suggesting the request never reaches the Genesys Cloud backend processing layer. It seems to be rejected at the gateway level. I suspect the Guest API WebSocket endpoint might require a different authentication mechanism or a specific user context token rather than a service account token. I have also tried using the urn:genesys:cloud:oauth:client scope, but that did not help.
Has anyone successfully implemented a headless Guest API client? I need to know if I should be using a different token type, such as a user impersonation token, or if there is a specific header required for the WebSocket upgrade. Any code snippets showing the correct handshake request would be appreciated. I am currently stuck on this authentication hurdle.