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NOTICE: We've Moved to a Ticket System for Support

As of August 31, 2017 (12am EST) our support forums will be retired (read-only), and we will be moving to a support ticket system.  This will allow us to better organize and answer support requests, and provide a more personalized experience as we assist our customers.

For the time being, we will leave our forums open for reading and learning while we work on creating a more robust Knowledge Base for everyone to use.

If you are a WC Vendors Pro customer please open a support ticket here. 

If you are a WC Vendors user please open a support ticket on the Wordpress.org forums.

The information on this forum is outdated and in most instances no longer relevant. Please be sure to check our documentation for the most up to date information.


Thank you to all of our customers!


Viewing 5 posts - 1 through 5 (of 5 total)
  • Author
  • #7910

    hello, i’ve set up the app credentials as suggested in your knowledge base but whenever i go to the checkout im getting “This transaction is invalid. Please return to the recipient’s website and try again.” message?

    Any thoughts?


    when i return to the checkout i get this message Error ID: 520003. Authentication failed. API credentials are incorrect.but ive double checked them and cant see where i have gone wrong!

    WC Vendors Support

    Most likely:

    1.) PayPal has your site configured wrong on THEIR end

    2.) You have your site configured wrong on YOUR end

    If you’re using Sandbox mode, try with Live mode. Sometimes PayPal’s sandbox can be a bit flaky according to Google Search Results.

    Whatever it is, the WC Vendors is working, because it’s returning an error message specifically from PayPal, which means you and PayPal are talking to each other but something’s up with the credentials.

    PayPal telephone support is also handy sometimes — A lot faster than email.



    Thank you for your fast reply! As always very efficient 🙂 My app is only conditionally approved, do i have to wait for it to be “approved”?


    I’ve found that the live gateway works with an app that’s conditionally approved. My problem was the invalid paypal address for the vendor. I want to say I’m surprised PayPal can’t even spit out a proper error code, but I’m not surprised at all.

    It would be handy to mention the valid paypal address only thing and the flaky sandbox gateway on this page:

Viewing 5 posts - 1 through 5 (of 5 total)
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