Verify that your callback URL expression is supported and registered by External Services as an asynchronous action.
Required Editions
| Available in: Lightning Experience |
| Available in: Enterprise, Performance, Unlimited, and Developer Editions |
For supported callback expressions, see External Services Asynchronous Callbacks.
- From Setup, in the Quick Find box, enter External Services, and then select External Services.
- Register the API specification that contains the callback expression.
-
Navigate to the Detail page of the external service that contains the callback
operation.
- If the callback expression is supported for a given operation, then the Callback Parameter column lists the callback parameter names.
- If there’s no value in the Callback Parameters column, then the callback expression isn’t supported, or the operation doesn’t contain a callback operation.
Note If the callback isn’t supported, External Services attempts to register the
operation as a normal, synchronous operation with a 120-second timeout on all
callouts.