<?php
/**
 * This will create a WordPress page everytime this hook runs. (i.e. When a user is added via WP Zapier plugin)
 * Add the below code to a custom plugin / child theme functions.php
 */
 function my_wp_zapier_create_post_example( $user_id ) {

    $post_data = array(
        'post_title' => 'The post title via wp_insert_post',
        'post_content' => 'Place all your body content for the post in this line.',
        'post_status' => 'publish', // Automatically publish the post.
        'post_author' => $user_id,
        'post_category' => array( 1, 3 ) // Add it two categories.
        'post_type' => 'page' // defaults to "post". Can be set to CPTs.
    );

    // Lets insert the post now.
    wp_insert_post( $post_data );

}
add_action( 'wp_zapier_after_create_user', 'my_wp_zapier_create_post_example', 10, 1 );