Setup CK API and Subscribe customer to Form

ck_subscribe.php

<?php


$options    = get_option( '_wp_convertkit_settings' );
$api_key    = $options && array_key_exists( 'api_key', $options) ? $options['api_key'] : null;
$api_secret = $options && array_key_exists( 'api_secret', $ptions) ? $options['api_secret'] : null;
$debug      = $options && array_key_exists( 'debug', $options) ? $options['debug'] : null;
$api        = new ConvertKitAPI( $api_key,$api_secret,$debug );

$form_id = '11111'; 
$name    = 'Test Test';
$email   = 'test@test.com';

$api->form_subscribe( $form_id, array( 'email' => $email, 'name' => $name ) );