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In this document, you’ll learn about the Mailchimp plugin, what it does, and how to use it.


Mailchimp is an email marketing service that can be used to create newsletters and subscriptions.

By integrating Mailchimp with Medusa, customers will be able to subscribe from Medusa to your Mailchimp newsletter and will be automatically added to your Mailchimp subscribers list.


This plugin is only used to allow your customers to subscribe but does not actually do any email sending. If you want to send emails to customers based on specific events, for example, when an order is placed, you should check out the SendGrid plugin instead.


Before going further with this guide make sure you have a Medusa backend set up. You can follow the Quickstart guide.

You also need a Mailchimp account, so please create one before you start.

Obtain Mailchimp Keys

To integrate the plugin into Medusa you need two keys: The API Key and the Newsletter list or Audience ID. The API Key acts as a credential for your account, whereas the Newsletter list ID determines which audience should the subscribed customers be added to.

You can follow this guide from Mailchimp’s documentation to obtain an API Key.

You can follow this guide from Mailchimp’s documentation to obtain your Newsletter list or Audience ID.

Install the Plugin

In the directory of your Medusa backend, run the following command to install the Mailchimp plugin:

npm install medusa-plugin-mailchimp

Add Keys

Open .env and add the following keys:


Make sure to replace <YOUR_API_KEY> with your API Key and <YOUR_NEWSLETTER_LIST_ID> with your Newsletter list or Audience ID.

Add Plugin to Medusa Config

Open medusa-config.js and add the new plugin into the plugins array:

const plugins = [
// ...,
resolve: `medusa-plugin-mailchimp`,
options: {
api_key: process.env.MAILCHIMP_API_KEY,

Test it Out

This plugin adds new POST and PUT API Routes at /mailchimp/subscribe. These API Routes require in the body of the request an email field. You can also optionally include a data object that holds any additional data you want to send to Mailchimp. You can check out Mailchimp’s subscription documentation for more details on the data you can send.

Without Additional Data

Try sending a POST or PUT request to /mailchimp/subscribe with the following JSON body:

"email": ""

If the subscription is successful, a 200 response code will be returned with OK message. If the same email address is used again in the POST, a 400 response will be returned with an error page. If this can occur in your usecase, use the PUT API Route to prevent this.


If you check your Mailchimp dashboard, you should find the email added to your Audience list.

Email Added

With Additional Data

Here’s an example of sending additional data with the subscription:

"email": "",
"data": {
"tags": ["customer"]

All fields inside data will be sent to Mailchimp’s API along with the email.

Use Mailchimp Service

To subscribe users to the newsletter without using this API Route or at a specific place in your code, you can use Mailchimp’s service mailchimpService in your API Routes, services, or subscribers. This service has a method subscribeNewsletter which lets you use the subscribe functionality.

Here’s an example of using the mailchimpService in an API Route:

import type { 
} from "@medusajs/medusa"

export const POST = async (
req: MedusaRequest,
res: MedusaResponse
) => {
const mailchimpService = req.scope.resolve(

{ tags: ["customer"] } // optional

You can learn more about how you can use services in your API Routes, services, and subscribers in the Services documentation.

Add Subscription Form

This section has a simple example of adding a subscription form in your storefront. The code is for React-based frameworks but you can use the same logic for your storefronts regardless of the framework you are using.

You’ll need to use axios to send API requests, so if you don’t have it installed make sure you install it first:

npm install axios

Then, in the component you want to add the subscription form add the following code:

import axios from "axios"
import { useState } from "react"

export default function NewsletterForm() {
const [email, setEmail] = useState("")

function subscribe(e) {
if (!email) {
}"http://localhost:9000/mailchimp/subscribe", {
.then((e) => {
alert("Subscribed successfully!")
.catch((e) => {
alert("An error occurred")

return (
<form onSubmit={subscribe}>
<h2>Sign Up for our newsletter</h2>
onChange={(e) => setEmail(}
<button type="submit">Subscribe</button>

This will result in a subscription form similar to the following:

Subscription Form

If you try entering an email and clicking Subscribe, the email will be subscribed to your Mailchimp newsletter successfully.

See Also

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