You can open the app the tickets are associated with and look in “My Events” or “My Tickets” to find digital copies of your tickets that you can add to Wallet. You can also receive your digital tickets from Messages, Safari, AirDrop Sharing, and a notification. [1] X Research source

If you have proximity alerts set, you can get a notification on your lock screen that shows your ticket when you are at the venue.

If the ticket is supported in Wallet, like an event ticket or movie ticket, it will automatically be added in your Passes section of Wallet. If it isn’t supported, you won’t be able to use Wallet.