lib/active_merchant/billing/gateways/skip_jack.rb in activemerchant-1.5.0 vs lib/active_merchant/billing/gateways/skip_jack.rb in activemerchant-1.5.1

@@ -354,10 +354,11 @@
       end
 
       def post_data(action, money, params = {})
         add_credentials(params, action)
         add_amount(params, action, money)
-        params.collect { |key, value| "#{key.to_s}=#{CGI.escape(value.to_s)}" }.join("&")
+        sorted_params = params.to_a.sort{|a,b| a.to_s <=> b.to_s}.reverse
+        sorted_params.collect { |key, value| "#{key.to_s}=#{CGI.escape(value.to_s)}" }.join("&")
       end
 
       def add_transaction_id(post, transaction_id)
         post[:szTransactionId] = transaction_id
       end