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);

?>

Works perfectly, thank you!

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

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@leandroprz I no longer work with WordPress so it's likely that the code is out of date.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@leandroprz I no longer work with WordPress so it's likely that the code is out of date.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.