How do I send receipts and billing notifications from my app?

To send receipts and billing notifications from your app, you generally need three pieces:

1. A payment/billing event source

   • Example: Stripe, PayPal, Apple/Google in-app purchases, your own invoicing system.
   • These systems usually emit events like:
     • payment succeeded
     • subscription renewed
     • payment failed
     • refund issued
     • invoice due

2. A notification delivery method

   • Email is the most common for receipts and invoices.
   • You can also use:
     • push notifications
     • in-app messages
     • SMS
   • For billing, email is usually best because it creates a record.

3. A backend service to generate and send them

   • Your app should not send billing notifications directly from the client.
   • Instead:
     • payment event happens
     • backend receives it, often via webhook
     • backend creates receipt/notification content
     • backend sends email/message through a provider

Typical setup

1) Listen for billing events

If you use Stripe, for example, set up webhooks for events such as:

• invoice.paid
• invoice.payment_failed
• charge.succeeded
• customer.subscription.updated

2) Generate the receipt or notification

Include details like:

• customer name
• amount charged
• currency
• date/time
• transaction ID
• invoice number
• plan or product purchased
• billing period
• tax breakdown if applicable

3) Send via an email service

Common providers:

• SendGrid
• Mailgun
• Amazon SES
• Postmark
• Resend

4) Store a copy

Keep a record in your database of:

• sent status
• recipient
• message type
• related transaction/invoice ID
• timestamp

This helps with support, retries, and audit trails.

Example flow

1. User pays in your app.
2. Payment provider confirms success.
3. Your server receives webhook.
4. Server creates a receipt.
5. Server sends email to user.
6. Server logs the notification.

Good practices

• Make receipts automatic after successful payment.
• Send billing failure notices quickly so users can update payment details.
• Make receipts downloadable from the app/account page.
• Use templates so emails look professional and consistent.
• Include unsubscribe options for non-transactional notifications, but note that true transactional billing emails are often exempt depending on jurisdiction.
• Secure webhooks by verifying signatures.
• Avoid duplicates by making notification sending idempotent.

If you’re using a specific platform

• Stripe: use webhooks + Stripe invoice/email features or your own email system.
• iOS/Android subscriptions: use App Store / Google Play server notifications.
• Custom billing: trigger emails from your own backend when payment records change.

If you want, I can show you:

• a Stripe example
• a Node.js backend example
• a Python example
• or a full architecture diagram for receipts and billing notifications.