Make sure every successful payment in my app produces a proper receipt email. Check what's sent now, if anything, and what it contains. Implement or fix: a receipt email triggered by the payment-success webhook (not the checkout redirect, so receipts match actual money movement and users who close tabs still get them); containing the amount, currency, date, what was purchased, the last four digits of the card or payment method, an invoice or order reference, and a link to view or download the invoice (the provider's hosted invoice URL is fine); sent exactly once per payment (idempotent with the webhook deduping); and covering renewals too, not just first purchases, since subscription customers need a receipt every cycle for expenses. Failed payments should never generate a receipt, and refunds should generate their own confirmation email referencing the original charge. Use the email system already in the project. Don't duplicate receipts the provider sends if I have its built-in receipts enabled; pick one sender so customers don't get two. Include my business name and support contact in the receipt so card statements are traceable back to me. Deliver: the receipt email with its trigger, the renewal coverage, the refund confirmation, and verification in test mode: complete a purchase, confirm one receipt with correct details, and confirm a renewal event produces one too.