lumen-coupons

[near shale]

PaymentElement doesn't support coupons out of the box - you're correct that you'd have to implement it yourself.

Let me check on the best way to handle updating the Payment Intent

Found it! This is what you want: https://stripe.com/docs/js/elements_object/fetch_updates
Basically, you'll make a server-side request to update the Payment Intent to the new amount, and then call fetchUpdates() to re-render the Payment Element

[ornate musk]

Thank you very much!

One more question, if I'm going to implement this functionality myself, should I still be using the Stripe coupons functionality in some way? Or should I be storing coupons and discounts they provide in my own database?

[near shale]

You're welcome to still create coupons through Stripe, but it's not necessary if you have no plans to ever move to checkout or billing (subscription/invoices) since you're doing all these calculations yourself