Reply to WhatsApp Business messages with Make

Connect your number through the official WhatsApp Business API in the dashboard and choose which chats WhatSync saves. On the Max plan, open Developers and create a key with read and send permissions.

Create a scenario with Webhooks → Custom webhook. Copy its HTTPS URL and activate the scenario. Add that URL in WhatSync Developers and select message.received. Make cannot check signatures on its own; if you need that, put the verification code from the webhook guide in a small receiver in front of it. Use a test event to check the connection; the filter below skips it.

type == "message.received"
data.message.channel == "business"
data.message.chat_type == "direct"
data.message.from_me == false

Make can deliver the same event twice. Store each event id in a Make data store and stop when it was already handled.

Add HTTP → Make a request: POST https://whatsync.app/api/v1/tools/send_message. Set Authorization: Bearer YOUR_API_KEY, Content-Type: application/json and an Idempotency-Key mapped from the incoming event id.

{"channel":"business","phoneNumber":"{{data.message.from.phone}}","text":"Thanks, we got your message and will reply soon."}

A free-form reply works because the customer just wrote to you, which opens WhatsApp's 24-hour reply window. To message someone first, send an approved template instead: templateName, templateLanguage, templateParameters and recipientOptInConfirmed=true. Check the response before retrying; never retry an uncertain result with a new key. Your reply creates message.sent, so it does not trigger the scenario again.