I would recommend Shopifys APIs. Theres a lot to them, they’re well documented, and you can build a developers store for free.
Adobe commerce is another one. You can get a dockerized store up and running pretty quickly, also free and their documentation includes some basic suggested workflows.
Edit: these are mostly for practicing consuming apis, not sure if thats what you were looking for.
It still feels wrong to me, to see it written out, but spoken its different.
I feel like it works to go with say, the 1600’s, which I read naturally as the 16 hundreds. But when I see 1900 I read that as the nineteen naughts, (aughts?) because so often when people are referring to periods in the 19 hundreds, its down to the decade because so much changed between each one. Or maybe I just felt that way because I’m so old now.
Maybe in another 25 years, it’ll be far enough away that 1900’s becomes 19 hundreds in my head.