PayPal - this invoice has already been paid

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Hace 12 años
Do we know why we are getting from time to time this message when you using SANDBOX PAYPAL ??
What makes PayPal believe that that specific transaction has already been handled?
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Hace 12 años
I think it's order number (1,2,3,...)

https://www.nopcommerce.com/boards/t/8455/restarting-order-id.aspx
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Regards,
Andrei Mazulnitsyn
nopCommerce team
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