Go on your store and logg in with the email address used for your booking

Play Store / App Store

Your ticket(s) are in the menu My Tickets.
The tickets are gathered pending on the type of ticket. The number of ticket per ticket is shown at the bottom right of the group tickets.

The QR Code will be displayed a few days prior to the event.
You can transfer the ticket even without the QR Code.

For security reasons you can't do a screenshot of the ticket. Transfer the ticket to the user.