Comment by jenanwise

I wrote some notes below (https://news.ycombinator.com/item?id=19740475) but TL;DR is that this lets us support a lot of features that that the legacy version never could. If you’re looking for an embedded form, Elements work great (https://stripe.com/docs/stripe-js/elements/quickstart) — you can of course pair Elements with a lightbox/modal library to get a similar experience to the legacy version of Checkout.