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This article applies to: ML v7, ML8, MultiStore

User Authentication Failed

Customers trying to check out with the PayPal Website Payments Pro payment gateway get a 'User Authentication Failed' message.

The store's IP address has not been registered with PayPal.

Contact PayPal or use your PayPal admin console to register the site's IP address.  Note that sites in shared hosting environments will likely have to register multiple IPs.  Your host can provide these.