The Client ID that will be used in the OAuth2 Client Credentials flow.
The Client Secret that will be used in the OAuth2 Client Credentials flow.
The endpoint that will be used in the OAuth2 Client Credentials flow. Expected to return a JSON with an access token and expires_in value (in seconds). The expires_in value, which must be a minimum of 30 seconds and a maximum of 3600 seconds, is how long Sinch will save the access token before asking for a new one.
Optional. Used for OAuth2 authentication.