Send WhatsApp payment reminders automatically with MoltFlow

Description

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