poison6feet Posted October 30, 2009 Share Posted October 30, 2009 Hi, I have followed and modified my code from the website www.phpwebcommerce.com to integrate a simple shopping cart with paypal. When I use the demo site on this website is working fine and order has been processed. However when I use this code I am getting the following msg on sandbox paypal. "This invoice has already been paid. For more information, please contact the merchant." Do I need to get the IPN from paypal or what to do please advise. Thanks Quote Link to comment Share on other sites More sharing options...
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