This page will store the PayPal Transaction ID and autosubmit the Sentry API data to paypal-confirm.php. If you aren't automatically redirected within 5 seconds, click the button below: That page would look something like this: The second thing you need is a confirmation page that will collect the PayPal Transaction ID and store it as a session variable, then collect the Sentry API data and autosubmit it to the final confirmation page. Step 2: Create an AutoSubmit Confirmation Page