    # File lib/active_merchant/billing/integrations/gestpay/helper.rb, line 59
              def encryption_query_string
                fields = ['PAY1_AMOUNT', 'PAY1_SHOPTRANSACTIONID', 'PAY1_UICCODE']

                encoded_params = fields.collect{ |field| "#{field}=#{CGI.escape(@fields[field])}" }.join(DELIMITER)

                "#{ENCRYPTION_PATH}?a=" + CGI.escape(@fields['ShopLogin']) + "&b=" + encoded_params + "&c=" + CGI.escape(VERSION)
              end