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Review: Paypal error on checkout "This invoice has already been paid"

Symptom:

The customer attempts to checkout using Paypal. When they attempt to make the payment, they get the error:

"This invoice has already been paid"

and they cannot proceed further.

Solution:

In your Paypal Merchant settings - you can make the following  update (below):

NOTE: this is not for the end-user customer to do in their Paypal - you as the merchant/seller receiving the payment need to make this change in your Paypal settings

Steps to resolve:

  1. Log into your PayPal business account on paypal.com.

  2.  Click the settings icon at the top of your PayPal account page and then click Profile and settings.

    Click My selling tools.

    Note: If you do not see the profile icon at the top of the page, click Profile, which appears in the top menu when the My Account tab is selected, and then click My selling tools.

  3. Click Update next to  Block payments  in the Getting paid and managing my risk section.

  4. Scroll down the page to the Block accidental payments  setting, and select the following option:

    • No, allow multiple payments per invoice ID  – Do not limit the number of payments received for an invoice. Choosing this option might result in duplicate payments that require a refund.

  5. Scroll to the bottom of the page and click Save.

This will prevent the error from popping up again for any further customers.

You can find more details at Paypal's support here.