How to receive HTTP POST in WP?

How do I listen for and receive a third party HTTP POST in WordPress so I can process the data in the post inside WordPress?

Not looking for the answer with code but rather the method by which WordPress would receive that HTTP POST.

Easy! You have a couple of options to do so.

The easiest one, but less safe, is to create a brand new PHP file in the root folder of WordPress. Let’s say we will call it get_post.php and add WordPress functionality to it.

Like so:

<?php 
    require_once('wp-load.php'); // add wordpress functionality
    $post = $_POST;

    if ( $something ) // security check
    update_post_meta( $post['post_id'], 'post_data', $post );
?>

The API link will be yourdomain.com/get_posts.php

Another option is to create a brand new page template inside of your template directory. And create a page using that template within your WordPress dashboard.

<?php 
    /* Template Name: Api Template */ 

    if ( ! defined( ‘ABSPATH’ ) ) {
        exit;
    }

    $post = $_POST;

    update_post_meta( $post['post_id'], 'post_data', $post );
?>

The API link will be: yourdomain.com/newly-created-page-permalink.