anchor.diff:  
   # Group Service authentication and user account
   
  -## User account [/*/account]
  +## User account [/{service}/account]
   
   ### List the available information concerning the authenticated user [GET]
   
  
positive.code:             "code": 401
          }
  
  ## Connect the user [/*/connect]
  
  ### Connect the user and start the oauth process [GET]
  
  
negative.code:             "authorize_url": "..."
          }
  
  ## User login [/{service}/login]
  
  ### Login after connection through oauth mechanism [GET]
  
  