helper.rb in activemerchant-1.41.0

- old
+ new

@@ -44,16 +44,20 @@
             @amount_in_cents = options[:amount]
             super
             add_field mappings[:signature], signature
           end
 
+          def amount_in_dollars
+            sprintf("%.2f", @amount_in_cents.to_f/100)
+          end
+
           def amount=(money)
             @amount_in_cents = money.respond_to?(:cents) ? money.cents : money
             if money.is_a?(String) or @amount_in_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", @amount_in_cents.to_f/100)
+            add_field mappings[:amount], amount_in_dollars
           end
 
           def currency(symbol)
             raise ArgumentError, "unsupported currency" unless SUPPORTED_CURRENCIES.include?(symbol)
             add_field mappings[:currency], symbol
@@ -101,10 +105,10 @@
 
           def sig_components
             components  = [merchant_key]
             components << fields[mappings[:account]]
             components << fields[mappings[:order]]
-            components << amount_in_cents.to_s.gsub(/[.,]/, '')
+            components << amount_in_dollars.to_s.gsub(/0+$/, '').gsub(/[.,]/, '')
             components << fields[mappings[:currency]]
             components.join
           end
         end
       end