Integrate WhatsApp with Mailchimp

Step by step

1. 1

   Provision your number on ZapZap API

   In the ZapZap API dashboard, create an instance and connect your WhatsApp by scanning the QR Code. Each active number costs R$15 per month on the prepaid model, and you start with a welcome credit when you create the account, subject to the current campaign. Copy your x-api-key and x-api-secret credentials in the API keys area.

2. 2

   Configure the Webhook on the Mailchimp Audience

   In Mailchimp, go to Audience, select the list, open Settings and click Webhooks. Add the URL of your intermediate endpoint and check the events that should trigger WhatsApp, such as Subscribes or Profile updates. Save so Mailchimp starts sending events with the phone number and contact data.

3. 3

   Create the journey in Customer Journeys

   For more advanced triggers, go to Automations, open Customer Journeys and click Create Journey. Choose a starting point such as Tag added or Signs up, and add an action journey point that calls your intermediate endpoint when the contact reaches that step.

4. 4

   Connect the intermediary to ZapZap API

   In your endpoint (n8n, Make or your own server), receive the Mailchimp payload, extract the phone number and make a POST request to ZapZap API's sending endpoint, sending the x-api-key and x-api-secret headers and the message text in the body.

5. 5

   Test and activate

   Sign up a test contact or apply the tag manually and confirm the message arrives on WhatsApp. Check the logs of Mailchimp and of your intermediary. Once the flow is validated, activate the journey for your whole list.

// ILLUSTRATIVE example: your endpoint receives the Mailchimp webhook
// and triggers WhatsApp via ZapZap API.
// Check the exact endpoints and fields at https://api.zapzapapi.com/llms.txt

const instanceId = "YOUR_INSTANCE";

// req.body comes from the Mailchimp webhook (Customer Journey / Audience)
const numero = req.body.data.merges.PHONE;   // contact phone number
const nome = req.body.data.merges.FNAME;      // first name

await fetch(`https://api.zapzapapi.com/api/v1/${instanceId}/send/text`, {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "x-api-key": process.env.ZAPZAP_API_KEY,
    "x-api-secret": process.env.ZAPZAP_API_SECRET
  },
  body: JSON.stringify({
    number: numero,
    text: `Hi ${nome}! We saw you signed up. Any questions, just reply here.`
  })
});