For Zencart
1. Find/includes/modules/payment/gspay.php script
2. Open and replace https://secure.rdgateway.com/payment/pay.php at https://secure.redirect2pay.com/payment/pay.php
3. Replace https://secure.rdgateway.com/payment/api.php with https://secure.redirect2pay.com/payment/api.php
不过似乎不能用的，正确的做法是
1. Find/includes/modules/payment/gspay.php script
2. Open and replace secure.rdgateway.com at secure.safepaymentgate.com
替换一个接口地址