We offer Amazon Pay in our Woocommerce shop. Around 50% of all orders get a pending status instead of completed. This is not a big deal. However, the users are not redirected to the thank-you-page but the checkout page again. They don't understand that the order was transmitted successfully and often click again on the buy button. It would be perfectly fine to redirect ALL orders to the thank-you-page since failed orders are extremly rare. I am a Woocommerce guy and have almost no experience with Amazon Seller Central. Sorry for this probably very stupid question.