CONTACT FORM 7 -> MAILCHIMP 3.0

wpcf7_send_to_mailchimp.php

<?php

// -------------------------------------------------------------------------- //
//                         CONTACT FORM 7 -> MAILCHIMP                        //
// -------------------------------------------------------------------------- //
//                  © 2015 Caio Tarifa. All Rights Reserved.                  //
// -------------------------------------------------------------------------- //

function wpcf7_send_to_mailchimp() {

  // Contact Form 7: Variables.
  $submission = WPCF7_Submission::get_instance();
  $data = $submission->get_posted_data();

  // Is user allowed?
  if (!$data['newsletter-opt-in'][0]) { return false; }

  // MailChimp: Variables.
  $api_key = '';
  $list_id = '';

  // MailChimp "Merge Fields" => Contact Form 7 fields.
  $merge_fields = array(
    'FNAME'  => $data['your-name'],
    'LNAME'  => $data['your-last-name']
  );
  
  $interests = array(
    'group-name' => filter_var($data['group-name'][0], FILTER_VALIDATE_BOOLEAN)
  );

  // Others...
  $email = $data['your-email'];

  // The magic!
  $domain = explode('-', $api_key)[1];
  $domain = 'https://'.$domain.'.api.mailchimp.com/3.0/lists/'.$list_id.'/members';
  
  $request_parameters = json_encode(array(
    'email_address' => $email,
    'email_type' => 'html',
    'status' => 'subscribed',
    'merge_fields' => $merge_fields,
    'interests' => $interests,
    'language' => 'pt'
  ));

  $session = curl_init($domain);

  curl_setopt($session, CURLOPT_HTTPHEADER, array(
    'Content-Type: application/json', 
    'Authorization: apikey '.$api_key
  ));

  curl_setopt($session, CURLOPT_POST, true);
  curl_setopt($session, CURLOPT_USERAGENT, 'ContactForm7');
  curl_setopt($session, CURLOPT_TIMEOUT, 5);
  curl_setopt($session, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($session, CURLOPT_POSTFIELDS, $request_parameters);

  $result = curl_exec($session);
  curl_close($session);

  return true;
}

add_action('wpcf7_mail_sent', 'wpcf7_send_to_mailchimp', 1);

?>

Unfortunately this stopped working for me and I'm not sure how to check what's causing the issue.

@leandroprz I no longer work with WordPress so it's likely that the code is out of date. Are you getting any errors?

@leandroprz I no longer work with WordPress so it's likely that the code is out of date. Are you getting any errors?

There are no error messages. I integrated this into a contact form with a "click to subscribe to my newsletter" checkbox. When sending the message it sends fine, but the email address is not being subscribed to the Mailchimp list.