anchor.diff:                                  Error   :: access_denied | invalid_request |
                                       invalid_scope | request_timeout | 
                                       server_error | unauthorized_client |
  +                                    unsupported_grant_type |
                                       unsupported_response_type,
                                   State   :: binary(),
                                   Context :: term()) ->
  
positive.code:                                         ",\"refresh_token\":\"" ++ 
                                          binary_to_list(RefreshToken) ++
                                          "\",\"scope\":\"" ++
                                          scope_string(Scope) ++"\"}", Request), 
       State}.
  
  
  
negative.code:                                         "\",\"expires_in\":" ++ 
                                          integer_to_list(Expires) ++ 
                                          ",\"scope\":\"" ++ 
                                          scope_string(Scope) ++"\"}", Response), 
       State}.
  
  -spec access_refresh_token_response(Request         :: #wm_reqdata{},
  