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Paypal Express Checkout Button This Transaction is invalid


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"This transaction is invalid. Please return to the recipient's website to complete your transaction using their regular checkout flow."


I installed Paypal Website Payments Pro for OSCommerce 2.2MS2 paypal_wpp_1.02

using PHP v5.2.5 and MySQL version 4.1.21

Globals is set by host = NO


When person is not login pressing the button will not goto Paypal


Let me know if there is any code missing.

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