MichaelMurray Posted June 3, 2011 Share Posted June 3, 2011 Hello, I am using PayPal Website Payments Standard and my customers keep getting the error message "This invoice has already been paid. For more information, please contact the merchant." This is happening over and over and do not have any idea what is causing this or how to fix it. Any ideas? Quote Link to comment Share on other sites More sharing options...
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