Launch WhatsApp bulk campaigns from Google Sheets with MoltFlow

Description

How it works

Send personalized WhatsApp campaigns to hundreds of contacts imported directly from a Google Sheet. This workflow creates a contact group in MoltFlow, launches a bulk send job with smart anti-spam delays, and reports campaign progress — all in one click.

You click "Execute" when ready to launch a campaign
Contacts are read from your Google Sheet (phone, name, and optional custom message per contact)
A custom group is created in MoltFlow with all valid contacts
A bulk send job is launched — MoltFlow handles message delivery with smart delays to protect your WhatsApp number
After 30 seconds, the workflow checks progress and shows a summary (sent, failed, remaining)

Set up steps

Setup takes about 5 minutes:

Create a MoltFlow account and connect your WhatsApp by scanning the QR code
Generate an API key from Sessions > API Keys tab (select the "Outreach" scope preset)
Prepare your Google Sheet with columns: phone, name, message_override (optional)
In n8n, connect your Google Sheets OAuth2 credential and your MoltFlow API Key (Header Auth with header name X-API-Key)
Open the Read Contacts from Sheet node and paste your Google Sheet URL
Open the Format Contacts code node and replace YOUR_SESSION_ID with your MoltFlow session ID
Customize the default message template if needed
Click Execute Workflow to launch

Google Sheet format

Your sheet needs these columns (headers in row 1):
phone** — phone number with country code, digits only (e.g. 1234567890)
name** — contact name
message_override** — (optional) custom message for this contact; if empty, the default template is used

Prerequisites

A MoltFlow account with a connected WhatsApp session
A Google Sheet with contact data
MoltFlow API key with custom-groups:manage, bulk-send:manage, bulk-send:read scopes