When logging into your Tickster account, you will see all transactions linked to your email address. If you have an ongoing booking, you can click on Show booking to read the purchase terms and pay for the booking by clicking on Pay the booking in the top left corner. You will then be redirected to the webshop to pay using the payment methods offered by the organizer.
If the booking is not paid on time, it will expire, and the tickets will be released for someone else to book.