Your customer will see a cancellation page if they decide to cancel their donation during the transaction. If you would like to use a page you have already created as your cancellation page, select Your page and enter your page's URL (web address) in the field provided. You can find your page's web address by navigating to the page on your website and copying its URL from the browser's address bar. Be sure to enter the complete URL of your page, such as https://www.your-site-here.net/cancel.html. If you would prefer to use the default PayPal cancellation page, you can leave this field blank.