I'm using the IWD Onestepcheckout extension in combination with PAYONE (3.1.3). And I can't get PAYONEs payment method "Credit Card" to work.

The check of credit card data is always performed twice. The first time the system always throws an error "Parameter {} cardexpiredate faulty or missing", even though the expiration date is ok.

I suspect there is something wrong with the Javascript that does the data validation. But I can't figure out where exactly the problem occurs. I have contacted the developers, but because this problem is caused by the conflict of extensions, they were not able to help.

I'm working on Magento CE

Any hints on how to solve this would be appreciated.

closed as off-topic by Marius, Mufaddal, Keyul Shah, Dexter, Moose Aug 5 '14 at 8:15

  • This question does not appear to be about the Magento e-Commerce platform within the scope defined in the help center.
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You probably need to address the checkout and alter the way the payments are processed there as Payone will make ajax calls for CC data validation and uses this to validate the payment later. Validation functionality depends on checkout/onepage process and if IWD OneStepCheckout process is different then it will fail and has to be adjusted

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