Apple Pay on Apple Store app

Hey guys, not sure if this is a deliberate change or whether I’m missing something but Apple Pay doesn’t appear to be an option on the Apple Store app. I’ve tried it on my iPad and my iPhone, Apple Pay being on both but no option there at all. Simply ‘add to cart’.

Might be a US-only feature for now? Honestly I had no idea it was even a thing on the Apple Store app until I read the release notes.

I’m thinking that must be it, seems weird that it’s not an option

I’ve used it before for iPhone 7 purchases.