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It is great you have this extension, do you have an update or can you offer any assistance, I really want to integrate this payment gateway but nothing is every that easy I am begining to think :O)
I am getting this message:
Payment Page Error
Sorry, but we have encountered an error.
Some invalid information has been sent to the Paymex payment service. This has been logged, and the administrator notified.
Details of this error are outlined below:
Error Code: 41
Error Detail: No items specified (amount)
If you consistently receive this error from clicking a link or button then please inform the referring site of this issue also.