Hi there,
Thanks for reaching out!
The error message you’re seeing — DUPLICATE_INVOICE_ID — indicates that PayPal is rejecting the transaction because it has detected a duplicate Invoice ID. This usually happens when an order with the same invoice ID has already been processed, and your PayPal account is set to require unique invoice IDs for each transaction.
WooCommerce normally generates a unique order number that’s used as the invoice ID, but this can sometimes be affected by custom code, third-party plugins, or if a retry attempts to reuse the same order ID.
Could you please confirm if you’re using any third-party code or plugins that modify order numbers or invoice IDs?
To assist you further, could you please share the System Status Report, which you can find by going to WooCommerce → Status?
Please use https://pastebin.com/ or https://gist.github.com/ and share a link to that paste in reply here. Once we have more information, we’ll be able to assist you further.
In the meantime, you might try placing a new order to see if the issue persists that can help confirm if it’s related to a duplicate ID from a previous attempt.
Hello thank you for your quick response.
We are using the WPCode Lite – Code Snippet.
Please see below the Website status: https://pastebin.com/H5y31RiQ
Thank you in advance.
Kind regards,
Stella
Hi there!
Thank you for sharing the system status report.
I tried to access the link you provided, but it appears to be password-protected. Could you please remove the password protection so we can access the report?
Also, could you please deactivate all plugins except for WooCommerce and PayPal, then try placing a test order to see if the issue still occurs?
Let us know how it goes!
I’ll go ahead and mark this as resolved since we haven’t gotten a response from you in a while. Let us know if you need further assistance down the line.
If you have a few minutes, we’d love if you could leave us a review: https://wordpress.org/support/plugin/woocommerce/reviews/
