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.

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

Set up steps

Setup takes about 3 minutes:

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

Prerequisites

A MoltFlow account (free tier available) A connected WhatsApp session MoltFlow API key with messages:send scope