You can insert any Java Script code under Scheduling Page > Settings > Show advanced settings so that it is executed when the appointment is booked.
A URL of your website (e.g. www.yoursite.com) can be entered in the field, or a redirect to your website can be made with the following command: window.setTimeout('window.parent.location = "http://www .yoursite.com" ',2000);
This is especially useful if you want to redirect to your thank you page, for example.
You can also add the SERVICEID parameter to evaluate which services have been booked (e.g. http://www.yoursite.com?service=SERVICEID).
The placeholder is then automatically replaced with the correct service ID.