php.php

<?php

require '../vendor/autoload.php';

// Is this actually an AJAX request
if ( isset( $_SERVER['HTTP_X_REQUESTED_WITH'] ) && ! empty( $_SERVER['HTTP_X_REQUESTED_WITH'] ) && strtolower( $_SERVER['HTTP_X_REQUESTED_WITH'] ) == 'xmlhttprequest' ) {
	exit;
}

// Let's us use WP functions
require_once $_SERVER['DOCUMENT_ROOT'] . '/wp-load.php';

// Get secret key from site options
$secret_key = get_field( 'secret_key', 'option' );

\Stripe\Stripe::setApiKey( $secret_key );

// header( 'Content-Type: application/json' );

// Sanitize POST Array
$POST = filter_var_array($_POST, FILTER_SANITIZE_STRING);

$fname = isset($_POST["fname"]) ? sanitize_text_field($_POST["fname"]) : '';
$lname = isset($_POST["lname"]) ? sanitize_text_field($_POST["lname"]) : '';
$email = isset($_POST["email"]) ? sanitize_text_field($_POST["email"]) : '';

// Calculate promo amount
$promo_exists = false;

$amount = 49900; //$499.00

// Get promo from form
$promo_code = isset($_POST["promo"]) ? sanitize_text_field($_POST["promo"]) : '';

$description = "Artificial Intelligence Solutions: An Introductory View from a Human-Machine Perspective";

$site_domain = get_site_url();

// Create Customer In Stripe
$customer = \Stripe\Customer::create(array(
	"email" => $email,
	"name" => $fname . ' ' . $lname,
	"description" => $description,
	"metadata" => [
		"first_name" => $fname,
		"last_name" => $lname,
	],
));

$checkout_session = \Stripe\Checkout\Session::create(array(
	'line_items' => array(
		array(
			'amount' => $amount,
			'quantity' => 1,
			'currency' => 'usd',
			'name' => $description,
		),
	),
	'mode' => 'payment',
	"metadata" => [
		"first_name" => $fname,
		"last_name" => $lname,
	],
	'allow_promotion_codes' => true,
	'success_url' => $site_domain . '/thank-you',
	'cancel_url' => $site_domain . '/register',
));

header( 'HTTP/1.1 303 See Other' );
header( 'Location: ' . $checkout_session->url );