Hi Maxiva,
There is something missing in includes/modules/payment/postfinance.php that prevents the checkout_process pages to correctly process the order.
Look for txtShopPara and replace the whole line with
PHP Code:
zen_draw_hidden_field('txtShopPara', session_name().'='.session_id()) .
By the way, there is another solution that involves swapping return urls to process the order after the payment has been made, when the user returns to the shop, but it is a bad solution. Some users just forget to return to the shop, leaving you with the same problem as you currently have (money moved but no order in shop).
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