About Manage Mailchimp Subscription

A lightweight module to subscribe, update, unsubscribe and delete users from lists in Mailchimp

Category 1Social, Feeds, Services
Modules that provide or work with social networking services and/or external feeds.
Category 2Email/WireMail
Modules that work with email as well as modules that implement ProcessWire’s core WireMail type.
Release StateBeta
Close to stable, but users are advised to be cautious and test thoroughly.*
Module Version0.0.4
Class NameSubscribeToMailchimp
Date AddedApril 24, 2018
Last UpdatedMay 27, 2018
Recommended ByNew recommendations may take up to 1 day to appear.


This module's files should be placed in /site/modules/SubscribeToMailchimp/
How to install or uninstall modules



Lightweight module for ProcessWire that let you subscribe a user to a mailchimp list.

I have only tested it with PHP7.x and Processwire 3.x.

The basic idea

// Easily subscribe a user with SubscribeToMailchimp
$mc = $modules->get("SubscribeToMailchimp");

How To Install

  1. Download the zip file at Github or clone directly the repo into your site/modules
  2. If you downloaded the zip file, extract it in your sites/modules directory.
  3. You might have to change the folders name to 'SubscribeToMailchimp'.
  4. Goto the modules admin page, click on refresh and install it.


  1. Log into your Mailchimp account and go to Profile > Extras > API Keys.
  2. If you don't have an API Key, create a new one.
  3. Copy your API Key and paste it in the module settings (Processwire > Modules > Site > SubscribeToMailchimp).
  4. Back in Mailchimp, go to the list, where you want your new subscribers.
  5. Go to Settings > List name and defaults. Copy the List ID an paste it into the module settings.
  6. Test your settings with the provided checkbox.

module settings


// load module into template
$mc = $modules->get("SubscribeToMailchimp");
 // subscribe / update a user in your default list
// add merge_fields to fill out user data, based on your list MERGE_FIELD options
// You need to setup the fields at "Settings > List fields and *|MERGE|* tags" first!
$mc->subscribe('john.doe@example.com', ['FNAME' => 'John', 'LNAME' => 'Doe']);
// Subscribe a user to a custom list (other than default)
$mc->subscribe('john.doe@example.com', ['FNAME' => 'John', 'LNAME' => 'Doe'], 'adcdef12345');
// Work with additional parameters (not merge_field values!)
$mc->subscribe('john.doe@example.com', NULL, NULL, [
	'language' => 'en', // find language list here: https://kb.mailchimp.com/lists/manage-contacts/view-and-edit-contact-languages#Language-Codes
	'vip' => true, // boolean vip status
	'location' => [ // geo location based on lat/log coordinates 
		'latitude' => '48.8722344',
		'longitude', => '2.7736192'
	'interests' => [ // subscribe user to interest categories / groups based on group id
		'32fec3561e' => true, 
		'63mel4395m' => false

Additional methods

// Unsubscribe a user
// Unsubscribe a user from a custom list
$mc->unsubscribe('john.doe@example.com', 'abcdef1356');
// Permanently delete a user. Carefully, this step cannot be undone!
// Get the subscription status of a user.
// Static function to test your settings.
// If no list id is provided, it will test your default list and returns a formated html result
$mc->testSettings('list id');

Important Notes

  • This module does not do any data validation. Use a sever-sided validation like Valitron
  • Make sure that you have set up your fields in your Mailchimp list. You can do it at Settings > List fields and *|MERGE|* tags


Example usage after a form is submitted on your page:

// ... validation of form data
$mc = $modules->get("SubscribeToMailchimp");
$email = $input->post->email;
$subscriber = [
  'FNAME' => $input->post->firstname,
  'LNAME' => $input->post->lastname,
$mc->subscribe($email, $subscriber);


In case of trouble check your ProcessWire warning logs.


I can't see the subscriber in the list

If you have enabled double opt-in (it is enabled by default) you will not see the subscriber, until he confirmed the subscription in the email sent by Mailchimp

I get an error in my ProccessWire warning logs

  • Check if you have the right List ID and API Key.
  • Check if you pass fields, that exist in your list.
  • Check if you pass a valid email address.

Go to Mailchimps Error Glossary for more Information


Until now, you can update from every version without changing your code

0.0.4 (May 27, 2018)

  • #6: Fixed a bug, where you couldn't use the 'ADDRESS' merge field and removed more unused lines - Big thanks to @ml-eds for the quick fix!
  • #4: Deleted unused line

0.0.3 (May 17, 2018)

  • #3: Updated subscribe method. You can now add additional parameters like language or interests. Find more about this in the Mailchimp API Documentation

  • #2: Added getStatus method $mc->getStatus($email, $list = "")

  • #2: Added ability to resubscribe a user, if he has unsubscribed. The user will have to confirm his subscription again via double-opt-in (if not disabled)

  • #1: Added testSetting method and a beautiful way to test your settings right in the module settings pages - Big thanks to @horst-n

  • Centralized the validation warning via a constant

  • Updated the getApiBase to be more flexible with different API calls

0.0.2 (April 24, 2018)

  • Added 'Unsubscribe' method $mc->unsubscribe($email, $list = "")
  • Added 'Delete' method $mc->delete($email, $list = "")
  • Removed type declarations to be compatible with PHP 5.1* (thanks to wbmnfktr)
  • Changed the way, the base url for the api gets called

*I have only tested it with PHP 7.x so far, so use on owners risk :)


Any suggestions? Join the Discussion in the ProcessWire Forums or contribute directly on Github.


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