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The e-commerce.

getting error for paypal-ipn


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I installed paypal-ipn and ccgv, sometimes, After I clicked the check out confirmation, go to the following page.




sometimes, getting following error:




Error Detected

This invoice has already been paid. For more information, please contact the merchant.



the reason is I did not buy the items, but it has an error detected. anyone knows what wrong? do i need re-install paypal ipn?



Thanks a lot

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