We send all ticket purchases as "e-commerce" data to Google Analytics (GA). This contains data about price, orders, event names, etc.
To view E-commerce in Google Analytics you must first enable "E-commerce" in the GA property.
If you want to setup Goals then add the following as your goal destination:
It may also be beneficial to take a look at the presentations in this article about how to integrate your Billetto account with Google Analytics.
It's important that you add the Billetto domain to your list of excluded referrers to exclude payment gateways as described in the slides.