# File lib/active_merchant/billing/integrations/direc_pay/helper.rb, line 72
          def amount=(money)
            cents = money.respond_to?(:cents) ? money.cents : money
            if money.is_a?(String) or cents.to_i <= 0
              raise ArgumentError, 'money amount must be either a Money object or a positive integer in cents.'
            end
            add_field(mappings[:amount], sprintf("%.2f", cents.to_f/100))
          end