listener

<?php

function pippin_stripe_event_listener() {

    if(isset($_GET['wps-listener']) && $_GET['wps-listener'] == 'stripe') {

        global $stripe_options;

        require_once(STRIPE_BASE_DIR . '/lib/Stripe.php');

        if(isset($stripe_options['test_mode']) && $stripe_options['test_mode']) {
            $secret_key = $stripe_options['test_secret_key'];
        } else {
            $secret_key = $stripe_options['live_secret_key'];
        }

        Stripe::setApiKey($secret_key);

        // retrieve the request's body and parse it as JSON
        $body = @file_get_contents('php://input');

        // grab the event information
        $event_json = json_decode($body);

        // this will be used to retrieve the event from Stripe
        $event_id = $event_json->id;

        if(isset($event_json->id)) {

            try {

                // to verify this is a real event, we re-retrieve the event from Stripe
                $event = Stripe_Event::retrieve($event_id);
                $invoice = $event->data->object;

                // successful payment
                if($event->type == 'charge.succeeded') {
                    // send a payment receipt email here

                    // retrieve the payer's information
                    $customer = Stripe_Customer::retrieve($invoice->customer);
                    $email = $customer->email;

                    $amount = $invoice->amount / 100; // amount comes in as amount in cents, so we need to convert to dollars

                    $subject = __('Payment Receipt', 'pippin_stripe');
                    $headers = 'From: "' . html_entity_decode(get_bloginfo('name')) . '" <' . get_bloginfo('admin_email') . '>';
                    $message = "Hello " . $customer_name . "\n\n";
                    $message .= "You have successfully made a payment of " . $amount . "\n\n";
                    $message .= "Thank you.";

                    wp_mail($email, $subject, $message, $headers);
                }

                // failed payment
                if($event->type == 'charge.failed') {
                    // send a failed payment notice email here

                    // retrieve the payer's information
                    $customer = Stripe_Customer::retrieve($invoice->customer);
                    $email = $customer->email;

                    $subject = __('Failed Payment', 'pippin_stripe');
                    $headers = 'From: "' . html_entity_decode(get_bloginfo('name')) . '" <' . get_bloginfo('admin_email') . '>';
                    $message = "Hello " . $customer_name . "\n\n";
                    $message .= "We have failed to process your payment of " . $amount . "\n\n";
                    $message .= "Please get in touch with support.\n\n";
                    $message .= "Thank you.";

                    wp_mail($email, $subject, $message, $headers);
                }

            } catch (Exception $e) {
                // something failed, perhaps log a notice or email the site admin
            }
        }
    }
}
add_action('init', 'pippin_stripe_event_listener');