Error: The transaction was refused as a result of a duplicate invoice ID supplied (PayPal Website Payments Pro)
Error Message: Message: The transaction was refused as a result of a duplicate invoice ID supplied. Attempt with a new invoice ID.
Cause: This error is seen when an account is being used or has been used with a different store. The Order IDs in your BigCommerce store are the same as those used with your other store, so PayPal is rejecting the transaction as a duplicate.
Resolution: To resolve this issue, you will find your other store's highest order ID and set BigCommerce order IDs to be much higher to ensure that there is no overlap.
1. In your PayPal Website Payments Pro account, locate the most recent order for your old store. (This will be the one with the highest order number.)
2. In BigCommerce, go to Store Setup › Store Settings and click on the Miscellaneous tab.
2. Under Starting Order Number in the Order Settings section, enter a new order number that is higher than the most recent order number for your other store. We recommend going up by at least 1000, or more if your other store is currently active.