I find out the problem : Credit card payment in two different currency.
1. We have use credit card payment plug-in.
In the generic configuration, the price is set at HKD. and 3.5%
2. Also, we have the USD Converter module installed. We have two options to choose, HKD and USD.
Customers are free to choose one currency at any time.
3. Local HK people buys and uses HKD currency. everything is fine.
Overseas customers comes on the site and set the currency at USD. ( which is opposite to Credit card price setup HKD.)
They start to buy the magazinees, they pass the login, address, and cart. At this point, it still showed the right price and shipping charges at USD.
Now, they go to Payment Selection, and problem starts here.
The Visa card show USD XXX. The value is wrong. I calulated the payment fee, which is HKD/7.8
They select the Visa card payment method, fill in the credit card information, and click NEXT button.
The payment fee is all wrong.
Please advise me how to correct the problem.