[eemax]

Cool post! I don't have a ton of experience using Stripe, but shouldn't you at least be handling some sort of payment_failed webhook?

It looks like you call _createSubscription and set the initial value for currentPeriodEnds before you know the payment actually succeeded, and since you don't ever check or listen for failed payments, anyone could get a free month (or year) of Checkly by using a bad card, or if the payment just randomly fails.

Maybe this isn't a huge deal in the early days, but you and your customer might not even notice the failed payment for quite a while unless you happen to check your Stripe dashboard!

[tnolet]

This is a great comment. And it's stupid I left this out of the post, as I made a conscious decision to not deal with that now. I should at some stage.

I actually had one failing credit card already, but my customer base in in the 30+ under 100 range, so I easily caught it. Also, it was totally benign from an early customer that just had bodged renewal for their card.