anchor.diff:            referer = undefined,
             success_url = undefined,
             failed_url = undefined,
  -          error_url = undefined,
             iss = undefined,
             sub = undefined,
             service_id = undefined,
  
positive.code:          get_return_urls/1,
           get_service_data/1,
  
           get_list/0
          ]).
  
  
negative.code: -module(watts_rsp).
  -include("watts.hrl").
  -include_lib("public_key/include/public_key.hrl").
  
  -export([new/1,
           exists/1,
  