I've the following issue with the payment service Alertpay.com
I've a drupal-based website, and I forward customers to Alertpay to insert their credit card information.
The issue is that Alertpay offers an option to change shipping address. I really don't like this, because each country has a different shipping rate (included in the total I pass to Alertpay).
Consequently a customer could set a country in my website, pay a low shipping rate, and then change the shipping address in Alert Pay without updating the shipping costs.
ps. There is also a field shipping_costs in AlertPay parameters, but still Alertpay provides an option to change shipping country. I don't get why, it is not logical.