WPGens Referral Mailchimp Connection

functions.php

<?php

add_action('wpgens_raf_new_user_referral_id', 'send_referral_to_mailchimp', 10, 2);

function send_referral_to_mailchimp($referral_id, $user_id) {
    $user = get_userdata($user_id);
    if (!$user) {
        return;
    }

    $email = $user->user_email;
    $first_name = $user->first_name;
    $last_name = $user->last_name;

    $referral_code = $referral_id; // Assuming this is the referral code

    // Send to Mailchimp
    send_to_mailchimp($email, $first_name, $last_name, $referral_code);
}

function send_to_mailchimp($email, $first_name, $last_name, $referral_code) {
    $api_key = 'YOUR_API_KEY';
    $list_id = 'YOUR_AUDIENCE_ID';
    $data_center = substr($api_key, strpos($api_key, '-') + 1); // Extract data center from API key

    $member_id = md5(strtolower($email));
    $url = "https://$data_center.api.mailchimp.com/3.0/lists/$list_id/members/$member_id";

    $json = json_encode([
        'email_address' => $email,
        'status_if_new' => 'subscribed',
        'merge_fields' => [
            'FNAME' => $first_name,
            'LNAME' => $last_name,
            'REFCODE' => $referral_code,
        ]
    ]);

    $response = wp_remote_request($url, [
        'method'    => 'PUT',
        'headers'   => [
            'Authorization' => 'apikey ' . $api_key,
            'Content-Type'  => 'application/json',
        ],
        'body'      => $json,
    ]);

    if (is_wp_error($response)) {
        error_log('Mailchimp error: ' . $response->get_error_message());
    } else {
        error_log('Mailchimp response: ' . wp_remote_retrieve_body($response));
    }
}