Process Incoming Webhook with Rest API v2

<?php

//Replace these variables with values relevant to your site.
$website_url = 'https://example.com/';
$entry_id = 123;
$api_key = string;
$api_secret = string;

$response = wp_remote_post( ' . $website_url . $api_key . $api_secret, array(
    'headers' => array(
        'Content-Type' => 'application/json; charset=utf-8',
    ),
    'body' => $json,
) );

if ( ! is_wp_error( $response ) ) {
    // The request went through successfully, check the response code against
    // what we're expecting
    if ( 200 == wp_remote_retrieve_response_code( $response ) ) {
        // Do something with the response
        // $body = wp_remote_retrieve_body( $response );
        // $headers = wp_remote_retrieve_headers( $response );
    } else {
        // The response code was not what we were expecting, record the message
        $error_message = wp_remote_retrieve_response_message( $response );
    }
} else {
    // There was an error making the request
    $error_message = $response->get_error_message();
}

complete