Anyone here tried vinagento’s one step checkout (http://www.vinagento.com/fast-checkout-aka-one-step-checkout.html) with Authorize.net? It keeps giving me “expiration date format” error (not in js, but as core error msg popup). I have emailed the developer and several days passed, I still haven’t heard from them. It’s been a great extension until I added authorize.net as payment. If I turn the OSCheckout extension off and use magento’s own one page checkout, it works fine. I have put a testing site online at http://15.artykitty.com with only this extension installed (payment is set to testing mode so no Cc will be processed) .
just for other searching this the answer and solution for this is documented on OneStepCheckout wiki page
http://www.onestepcheckout.com/wiki/index.php/Credit_card_payments_are_failing_to_validate
One Step Checkout Pro
As this simplified effective check out process will let the transactions done in a single page, it will save the enormous precious time of your customers for sure. It definitely attracts the customers to utilize this One Step Checkout instead of normal check out process which is having six steps to make it done.
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