    # File lib/active_merchant/billing/integrations/nochex/helper.rb, line 22
              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