# File lib/active_merchant/billing/integrations/direc_pay.rb, line 15
        def self.service_url
          mode = ActiveMerchant::Billing::Base.integration_mode
          case mode
          when :production
            self.production_url
          when :test
            self.test_url
          else
            raise StandardError, "Integration mode set to an invalid value: #{mode}"
          end
        end