We used Checkout UI Extension to build the Point feature when user purchase on checkout page.
All work fine, we could input point usage, or display text on checkout page though App Block, but when we choose the Amazon Pay method, after we login, all App Block has gone. We couldn't see any App Block display on Checkout Page.
Anyone who are same issue, let me the idea.
Here are screen shoot what I get
1. By using Amazon Pay
2. Other payment (work fine)
Just to confirm - when you go to checkout by using an Amazon accelerated checkout button on the product page, the checkout is not showing the extension you added? Is this the flow you are currently testing?
You are correct, when I select Amazon Payment Method, the checkout ui is transform from One Page Checkout (my configuration) into Three Page Checkout Amazon Pay, and all of my App Block of my extension has gone.
I've connected with the product team on this and it does appear that checkout UI extensions are not currently supported on the accelerated checkouts yet (eg: Amazon Pay, G Pay, etc) but we are working towards this.
Hope this helps,