Updated all related logic of cert check and authorization on publish, and minor fix on provider

doc/testing/testplan/api_security_service/README.md

@@ -1100,7 +1100,7 @@ At this documentation you will have all information and related files and exampl
 
   1. Response to Request of Access Token:
      1. **400 Bad Request** response.
-     2. body returned must accomplish **AccessTokenErr** data structure, with:
+     2. body returned must accomplish **ProblemDetails** data structure, with:
         * title=Bad Request
         * detail='not_valid' is not one of \\['client_credentials', 'authorization_code'\\] - 'grant_type'
         * status=400