[dinny]

I recently implemented x-payment hosted.
so far i have been uncomfortable with x-payment hosted process.
yesterday, I added coupon code in the store wide and customers tried checkout but it did not go through on so many orders.
This is first time to have a coupon code since using x-payment hosted.
without coupon code applied payment goes well.

when coupon code applied, below error comes up.

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Order processing error


Order declined.
Review your data or contact the store administrator.



Reason: Error: Transaction refused because of an invalid argument. See additional error messages for details. (The totals of the cart item amounts do not match order amounts.)

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I guess coupon code field is not going to x-payment page.

Is there any way to solve this problem?
this is so critical for me.

thank you