Amazon has discontinued Flexible Payment Services, Amazon Webstore Services, and others. Presumably your warning to not rely on proprietary implementations is vendor-agnostic?
Or at the very least: never rely on one vendor's proprietary implementation(s). Always have at least two in active use (though you can do something like using one vendor 95% of the time), and if/when one goes down make it your top priority to find another.
Or at the very least: never rely on one vendor's proprietary implementation(s). Always have at least two in active use (though you can do something like using one vendor 95% of the time), and if/when one goes down make it your top priority to find another.