currency= (ActiveMerchant::Billing::Integrations::Gestpay::Helper)

    # File lib/active_merchant/billing/integrations/gestpay/helper.rb, line 38
              def currency=(currency_code)
                code = CURRENCY_MAPPING[currency_code]
                                            raise StandardError, "Invalid currency code #{currency_code} specified" if code.nil?

                                            add_field(mappings[:currency], code)
              end