He receives the ticket information by email.
what if the user buys the ticket as a guest?
Registered users are redirected to "Purchased tickets" page. After purchase, buyer gets an email with ticket details. Also the organizer is notified about the tickets he sold.
If you do not receive the emails please use SMPT server: https://www.wpbeginner.com/wp-tutorials/how-to-use-smtp-server-to-send-wordpress-emails/