One Page Checkout Support in General Add-Ons Support Posted May 20, 2009 I will warn everyone now, payment modules are mostly supported for oscommerce version 2.2 ms2, at some point the oscommerce team changed how the payment modules work. ( ie. they use $paymentmodule->confirmation() to pull up the entry fields and enter orders, rather than using the $paymentmodule->selection() function for the entry fields and the confirmation function for entering orders ) there's code there in the includes/classes/onepage_checkout.php to comment or uncomment to support these, remember to never set the checkout to live without testing your payment method with it, as sometimes it can take some tweaking to get it working 100%. Also, there's a new update coming soon for the charsets. Here's the deal: AJAX only supports sending data back using the UTF-8 charset so we've added a function to help this process work with database data and input entered data to hopefully stop the issues with encodings once and for all.