shopify-mailchimp-connector.php

<?php

define('SHOPIFY_APP_SECRET', 'your_secret_here');
define('MailChimp_API_KEY', 'your_mailchimp_api_key here');

$mailchimp_list_id = 'mailchimp list id here';

function verify_webhook($data, $hmac_header)
{
    $calculated_hmac = base64_encode(hash_hmac('sha256', $data, SHOPIFY_APP_SECRET, true));
    return hash_equals($hmac_header, $calculated_hmac);
}


$hmac_header = $_SERVER['HTTP_X_SHOPIFY_HMAC_SHA256'];
$data = file_get_contents('php://input');
$verified = verify_webhook($data, $hmac_header);

if($verified) {

    $customer_data = json_decode($data);
    $customer_email = $customer_data->email;

    mc_subscribe($customer_email, '', MailChimp_API_KEY, $mailchimp_list_id, 'us7');

}

# credit for function below goes to https://github.com/actuallymentor/MailChimp-API-v3.0-PHP-cURL-example 

function mc_subscribe($email, $fname, $apikey, $listid, $server) {
    $auth = base64_encode( 'user:'.$apikey );
    $data = array(
        'apikey'        => $apikey,
        'email_address' => $email,
        'status'        => 'subscribed',
        'merge_fields'  => array(
            'FNAME' => $fname
            )
        );
    $json_data = json_encode($data);
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, 'https://'.$server.'api.mailchimp.com/3.0/lists/'.$listid.'/members/');
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json',
        'Authorization: Basic '.$auth));
    curl_setopt($ch, CURLOPT_USERAGENT, 'PHP-MCAPI/2.0');
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_TIMEOUT, 10);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $json_data);
    $result = curl_exec($ch);
   
    die();
}

?>