It depends on the operator! Some providers allow you to board directly using the Bookaway voucher or e-ticket, while others require you to print the voucher or exchange it for a physical ticket before boarding.

To be sure, always check the instructions on your Bookaway confirmation email. If a ticket is attached to the confirmation email, that's usually what you'll need to present when boarding. If printing or exchanging a physical ticket is necessary, the voucher will provide clear instructions on how to do that.