Notify customers on WhatsApp when Stripe payment succeeds with MoltFlow

How it works

1. Stripe fires a checkout.session.completed webhook when a payment succeeds
2. Customer name, phone, email, and payment amount are extracted
3. If the customer has a phone number, a WhatsApp receipt is sent via MoltFlow
4. Payments without phone numbers are logged and skipped

Set up steps (~5 min)

1. Create a MoltFlow account at molt.waiflow.app and connect your WhatsApp
2. Generate an API key in MoltFlow (Sessions page > API Keys tab)
3. Activate this workflow and copy the webhook URL
4. In Stripe Dashboard > Developers > Webhooks, add the n8n URL for checkout.session.completed
5. Set YOUR_SESSION_ID in the Format Receipt code node
6. Add your MoltFlow API Key as Header Auth credential (header name: X-API-Key)

Prerequisites

• MoltFlow account with active WhatsApp session
• Stripe account with webhook access
• Customer phone numbers collected during checkout (Stripe customer_details.phone)