That’s pretty simple, just use your website home url 🙂
After that, just fire an action when the page is loaded via POST HTTP method and hook with a callback.
add_action( 'wp_loaded', function() {
if ( $_SERVER['REQUEST_METHOD'] === 'POST' ) {
// fire the custom action
do_action('onchangeapi', new PostListener($_POST));
}
} );
And now the listener class
class PostListener {
private $valid = false;
/**
* @param array $postdata $_POST array
*/
public function __construct(array $postdata) {
$this->valid = $this->validatePostData($postdata);
}
/**
* Runs on 'onchangeapi' action
*/
public function __invoke() {
if ($this->valid) {
// do whatever you need to do
exit();
}
}
/**
* @param array $postdata $_POST array
* @return bool
*/
private function validatePostData(array $postdata) {
// check here the $_POST data, e.g. if the post data actually comes
// from the api, autentication and so on
}
}