Stripe Payment Failed
Send this when Stripe reports a failed invoice payment. It says the payment did not go through, gives the likely reason, and lists the amount due, card, status and next retry date above an Update payment details button. Trigger it from invoice.payment_failed and match the retry date to your Stripe retry settings.
Loops
Turn one email into a short sequence
Turn on invoice.payment_failed in the Loops Stripe settings and set the workflow trigger to Event received, Stripe, invoice.payment_failed. A single notice is easy to miss, so add a reminder a few days later and a final notice before the subscription ends, with an audience filter that removes customers once they pay. The Stripe payment emails guide shows the full setup, including a test with the Stripe CLI.