How to do MailChimp MERGE field with ADDRESS type

pmpro-mailchimp-merge-with-address-field.php

<?php
//Address merge types must be handled in a very specific format
function my_pmpro_mailchimp_listsubscribe_fields($fields, $user)
{
	$user_info = get_userdata($user->ID);
	
	$new_fields =  array(
	"FNAME" => $user->first_name, 
	"EMAIL" => $user->email, 
	"LNAME" => $user->last_name,
	"ADDRESS" => array( 'addr1' => $user_info->pmpro_baddress1,
                            'addr2' => $user_info->pmpro_baddress2,
                            'city' => $user_info->pmpro_bcity,
                            'state' => $user_info->pmpro_bstate,
                            'zip' => $user_info->pmpro_bzipcode,
                            'country' => $user_info->pmpro_bcountry)
      );

    $fields = array_merge($fields, $new_fields);
      
    return $fields;
}
add_action('pmpro_mailchimp_listsubscribe_fields', 'my_pmpro_mailchimp_listsubscribe_fields', 10, 2);

This recipe is included in the blog post on "Send a Member’s Address Fields to Mailchimp" at Paid Memberships Pro here: https://www.paidmembershipspro.com/send-members-address-fields-mailchimp/