It can be useful to send tickets out as a PDF to make it easier for ticket buyers to print, share and download tickets to their phone.
To set this up:
Go to 'Box office settings'
Click on 'Confirmation emails'
Choose 'Event confirmation emails'
Tick the box at the bottom that says 'Attach ticket vouchers as a PDF' and then click 'Save'.
Your ticket buyers will now receive a PDF attached to their order confirmation email that looks like this: