First, that error is issued when a customer is creating an account. The PayPal/RESTful payment module only comes into play during the checkout process.
If you're getting 404's using PayPal RESTful, it could be that the ppr_webhook_main.php isn't present in the root-directory of the site. You can tell more by inspecting the site's raw-access logs to see what page/file the 404's being issued for.



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