Released prior to 1.43.
Authenticate a client-extension application. Based on the application’s SSL client certificate presented by the TLS layer, it authenticates the client-extension application and returns a Symphony verification token.
See also: Application Authentication in the Client Extension API documentation.
Note: As of Symphony's 20.14 release to production environments, this endpoint is deprecated. This endpoint will not be supported anymore in the near future. Please use the RSA authentication instead.