NopCommerce Version: 4.30 Plugin Version: Paypal Standard v.1.60
Hi!
I have a problem of redirection when the payment is completed. I use a business account on Paypal. I follow all steps correctly and I use sandbox for tests. When I valid the checkout I'm redirected to Paypal to pay and when I click on the return to website button I'm redirected to the PDTHandler action of my website. It works correctly but the PDTHandler action proceed to a redirection to the Home of my shop instead of redirect me to the "CheckoutCompleted" action.
I got the same error as you before. I think that the "AutoValidateAntiforgeryToken" on the controller isn't working correctly. I temporarily solved this in my version by adding "[IgnoreAntiforgeryToken]" attribute of the PDTHandler action at PaymentPayPalStandardController.cs line 337.
But then I got the problem that I describe in my first message.