Email about an upcoming charge is automatically sent a couple of days in advance, that’s Stripe standard feature. The other question is whether the user actually check their email (or which email they registered with).

As for cancellation, the problem is that even though it’s easy to cancel a subscription, chargebacks usually happen afterwards. It doesn’t matter how simple cancellation is, what matters is that the user first cancel and then still goes and files a chargeback.

> Email about an upcoming charge is automatically sent a couple of days in advance

I'm talking about additional email. 24 hours before the transaction. With the subject "You'll be charged $10 for renewal in 24 hours".

This email will hit a lot harder. Most people's inbox is full of transactional email, as per recent post here on HN.