WooCommerce Abandoned Checkout Flow with MailChimp

woo-abandoned-checkout-mailchimp.php

<?php
// Add this code to a custom plugin on your site to add customer emails to your abandoned checkout flow
// Requires the free plugin code here: https://hollerwp.com/woo-checkout-save-email/

// You need to install this first: composer require drewm/mailchimp-api 
// see https://github.com/drewm/mailchimp-api
use \DrewM\MailChimp\MailChimp;
$MailChimp = new MailChimp('abc123abc123abc123abc123abc123-us1'); // change this to your MC API key

// this action fires when a new email is added to your checkout
add_action('sb_woo_checkout_email', 'sb_woo_save_email' );
function sb_woo_save_email( $email ) {

  // add the user to an email list for abandoned carts. for example, send them an email a day later with a coupon.
  sb_subscribe_mc( $email );
    
}

// if the user completes checkout, remove them from the cart abandonment flow
add_action( 'woocommerce_new_order', 'sb_abandonment_unsubscribe' );
function sb_abandonment_unsubscribe( $order_id ){

    $order = wc_get_order( $order_id );
    $user = $order->get_user();
    if( $user ){
      // remove this person from your abandoned cart email flow here
      sb_delete_from_mc( $user->user_email );
    }
}

// subscribe customer to our MailChimp list
sb_subscribe_mc( $email ) {
  
  // change to your list ID
  $list_id = 'b1234346';

  $result = $MailChimp->post("lists/$list_id/members", [
    'email_address' => $email,
    'status'        => 'subscribed',
  ]);
  
}

// unsubscribe from abandoned checkout list
sb_delete_from_mc( $email ) {
  
  // change to your list ID
  $list_id = 'b1234346';

  $subscriber_hash = MailChimp::subscriberHash( $email );

  $MailChimp->delete("lists/$list_id/members/$subscriber_hash");
  
}