The problem with Checkout/Billing and co are that when they're missing a key feature you're forced to unwind the whole thing. A good example is the classic Saa

The problem with Checkout/Billing and co are that when they're missing a key feature you're forced to unwind the whole thing. A good example is the classic SaaS scheduled downgrade. In 99% of SaaS plans I've seen downgrading a plan happens at the end of the period. As far as I could tell such a feature didn't exist in the redirect based Billing offerings of stripe as of 6 months ago.