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This is a screenshot where did i am stuck.I got this error.I can update catalog payment checkout.php file but same error are occur.
looks like an problem with your parameters, the source must look like this :
<form action='https://www.yourwebsite.com/checkout/purchase' method='post'>
<input type='hidden' name='sid' value='123' >
<input type='hidden' name='quantity1' value='1' >
<input type='hidden' name='product_id1' value='1008' />
<input type='hidden' name='quantity2' value='1' >
<input type='hidden' name='product_id2' value='1014' >
<input name="submit" type='submit' value='Buy from 2CO' >
Note : the variable "sid" is needed to recognize to payment account !