Hi,
Thanks, I was able to access the website.
So I checked the issue, and looked online.
So it seems that the Amazon Checkout API has been discontinued at some point, and not Amazon only has a new Amazon Pay API (completely different from the one we had implemented in the past with the Amazon Pay plugin).
Looking a bit deeper into it, the Amazon Pay SDK for PHP (
github.com/amzn/amazon-pay-api-sdk-php
), which they recommend using for Amazon Pay, still mentions "Amazon Checkout v2" while linking to Amazon Pay API documentation.
So from what I understand, they've made a new version of Amazon Checkout incompatible with the v1, then, renamed it Amazon Pay, while removing the previous API version endpoints.
So unfortunately, I don't have a solution there.
It will require redeveloping a new Amazon plugin from scratch. In the mean time we're going to remove it from HikaShop and our documentation.