Example of a Zapier Webhook listener that imports microblog entries into a CPT named 'news'

functions.php

<?php

/**
 *  Zapier Webhook Listener - Creates a status update into the custom post type 'news' , tags it, categorizes it
 */
    
/* define your secret key - must match the webhook secret key you inputted into the Zapier Zap. */
$ztw_secretkey = 'supersecretkey'; 

/* hook action to the WordPress 'init' hook. This will process webhook requests from Zapier */
add_action('init' ,'ztw_webhook_create_status');

/* let's build the actions we should take when the webhook is accessed */
function ztw_webhook_create_status() {

    /* lets only run actions when we're suposed to */
    if (!isset($_GET['action']) || $_GET['action'] != 'create-custom-status' || !$_REQUEST['status_pubdate']) {
        return;
    }

    /* let's load our secret key */
    global $ztw_secretkey;

    /* let's match the POST request's secret key to our secret key and exit if they do not match */
    if ($_GET['token'] != $ztw_secretkey ) {
        echo json_encode(array('error'=>true));
        return;
    }

    /* create visually friendly date */
    $date =  new DateTime($_REQUEST['status_pubdate']);

    /* import the title and limit it to 60 characters */
     if (strlen( $_REQUEST['status_nohashtag_nolink']) > 60) {
         $title = substr($_REQUEST['status_nohashtag_nolink'], 0, 60) . ' ...';
    } else {
        $title = $_REQUEST['status_nohashtag_nolink'];
    }

    /* build content without hashtags */
    $status = $_REQUEST['status_nohashtag_nolink'] . "\r\n" . $_REQUEST['permalink'] ;

    /* create new status */
    $data = array (
        'post_title'=> $title ,
        'post_content'=>  $status,
        'post_status'=> 'publish',
        'post_type'=> 'news' /* change this to your custom post type */

    );

    /* create the new post in the WordPress database */
    $post_id = wp_insert_post($data);

    /* set tags if they are available */
    if (isset($_REQUEST['tags'])) {
        wp_set_post_terms( $post_id , $_REQUEST['tags'] , 'news_tags', true );
    }

    /* set featured image if available - save it to the media gallery */
    if (isset($_REQUEST['featured_image'])) {
        ztw_generate_featured_image($_REQUEST['featured_image'] , $post_id , 'Auto generated via hudson-custom.php' );
    }

    /* Set Category Tag */
    wp_set_post_terms( $post_id , $_REQUEST['channel'] , 'news_categories', true );

    /* echo the post id back to Zapier and exit the script */
    echo $post_id;
    exit;

}

/**
* Downloads an image from the specified URL and attaches it to a post as a post thumbnail.
*
* @param string $file    The URL of the image to download.
* @param int    $post_id The post ID the post thumbnail is to be associated with.
* @param string $desc    Optional. Description of the image.
* @return string|WP_Error Attachment ID, WP_Error object otherwise.
*/
function ztw_generate_featured_image( $file, $post_id, $desc ){

    require_once(ABSPATH . "wp-admin" . '/includes/image.php');
    require_once(ABSPATH . "wp-admin" . '/includes/file.php');
    require_once(ABSPATH . "wp-admin" . '/includes/media.php');

    // Set variables for storage, fix file filename for query strings.
    preg_match( '/[^\?]+\.(jpe?g|jpe|gif|png)\b/i', $file, $matches );
    if ( ! $matches ) {
         return new WP_Error( 'image_sideload_failed', __( 'Invalid image URL' ) );
    }

    $file_array = array();
    $file_array['name'] = basename( $matches[0] );

    // Download file to temp location.
    $file_array['tmp_name'] = download_url( $file );

    // If error storing temporarily, return the error.
    if ( is_wp_error( $file_array['tmp_name'] ) ) {
        return $file_array['tmp_name'];
    }

    // Do the validation and storage stuff.
    $id = media_handle_sideload( $file_array, $post_id, $desc );

    // If error storing permanently, unlink.
    if ( is_wp_error( $id ) ) {
        @unlink( $file_array['tmp_name'] );
        return $id;
    }

    return set_post_thumbnail( $post_id, $id );

}