Send contacts from any system to Mailchimp through a webhook

A webhook receives a contact from your site, CRM or shop and adds it to your Mailchimp audience with tags.

Use this template Create a free account

Everything is created inactive in a new folder of your account. Nothing runs until you activate it, and you can undo it for 24 hours.

What it does

Connect any tool that can call a URL (Elementor, Typeform, Tally, your CRM, your online shop…) with Mailchimp. You send a POST with the contact and the flow creates or updates it in your audience, without duplicates, and applies the tags you specify.

POST body (JSON): {"email":"ana@example.com","nombre":"Ana","apellidos":"Perez","etiquetas":"customer,shop"}. etiquetas is optional (several, comma separated).

By default the subscription uses double opt-in. Use subscribed only if you already have the person's consent.

What you need: a Mailchimp account, an API key and the audience ID (steps below).

How to set it up

1
Copy the webhook URL (Recibir contacto)
A new URL is generated on install. Paste it into the external system that must call this workflow.
2
Connect Mailchimp
In Mailchimp go to Account > Extras > API keys and create a key (it looks like xxxxxxxx-us21). In Credentials create a Basic Auth one named mailchimp: username = anything, password = the API key. The audience ID is under Audience > Settings > Audience name and defaults.
3
Set your audience
In the Configuración node set your audience lista_id.
4
Test the webhook
Copy the URL of the Recibir contacto node and send a POST with {"email":"you@email.com","nombre":"Test"}. The response says whether the contact is pending confirmation or subscribed.
5
Activate the workflow
Workflows are installed inactive. Once everything is set, activate it.