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Thank you for your reply. I found that the problem solved after I enabled IPN in paypal sandbox :P Thank you very much for your help.

I'm not very sure if your problem is due to the IPN, but you may try and test for it. The URL to put in is http://(your website)/checkout_process.php I've read the forum and saw someone said that the paypal IPN is renamed as Web payment standard, don't know if it's true.

I've had a similar problem as you before. Which PayPal module are you using? PayPal, PayPal IPN or PayPal Website Payments Standard?

Have you enabled Instand Payment Notification (IPN) in your sandbox seller account?

Hi, I'm using osCommerce 2.2 rc 1. I've tested out the basic version of paypal payment, but it cannot send back the order to my admin site. I read the forum and many people say that Paypal IPN is better and solve this problem, so I use IPN instead. I tested it using sandbox. After I pay using paypal IPN, I found two problems: 1) When I press the return button and want to return to my own site, it returned to the login page and ask me to login(as a customer). I notice the link is login.php?action=process , but after I login it just shown the index page instead of any page about my payment. 2) After I login to my site, I find my shopping cart still contain the item that I paid. The quantity is not updated. Is there any method to solve this problem? Will this problem be solved if I use live instead of sandbox? Some additional information about my Paypal IPN settings: Enable Encrypted Web Payments: False Your Private Key: (blank) Your Public Certificate: (blank) PayPals Public Certificate: (blank) Your PayPal Public Certificate ID: (blank) Working Directory: (blank) Will the add-on at http://addons.oscommerce.com/info/5655 solve the problem? If yes, is it competible to the osCommerce version that I'm using? Thank you very much for your kind attention. If someone know any answers to the above questions please help. Thank you in advance.