Send WhatsApp payment reminders automatically with MoltFlow

How it works

This workflow automates WhatsApp payment reminders using the MoltFlow API. No more chasing clients manually — reminders go out every morning at 9 AM with personalized messages.

1. A schedule trigger fires daily at 9 AM 2. A code node builds your contact list with names, amounts, and due dates 3. Each contact receives a personalized WhatsApp reminder via MoltFlow 4. Results are logged — you can see which messages succeeded and which failed

Set up steps

Setup takes about 3 minutes:

1. Create a free [MoltFlow](https://molt.waiflow.app) account and connect your WhatsApp by scanning the QR code 2. Generate an API key from Sessions → API Keys tab (select the "Messaging" scope preset) 3. In n8n, add a Header Auth credential — set header name to X-API-Key and paste your MoltFlow API key as the value 4. Open the Prepare Contacts code node and replace YOURSESSIONID with your MoltFlow session ID 5. Edit the contacts array with your actual client data (phone, name, amount, due date) 6. Customize the message template if needed 7. Activate the workflow — reminders will go out every morning

Prerequisites

- A [MoltFlow](https://molt.waiflow.app) account (free tier available) - A connected WhatsApp session - MoltFlow API key with messages:send scope