With the ferry companies that accept electronic tickets, some require you to check-in before your trip in order to receive your electronic ticket via email. Make sure to check-in before the online check-in cut-of time (usually 2hrs before your departure time).
Openferry will send you a trip reminder to remind you and if you have downloaded the app, you will also get a notification!Once you complete your booking, your My Trips page will guide you through the check-in process if required and you'll be able to receive all your tickets.
The companies that currently accept electronic tickets and require check-in are:
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The list above is updated periodically, but to make sure you have the most up to date information, just look for the QR code icon in the search results to know for certain that the ferry company you are traveling with accepts electronic tickets or not.