...and it works, everytime.
But a good question - here's how you find the barcode:
1. Log onto your account in the Freo app.
2. Select 'My Account Settings' under 'Membership'.
3. Select 'Manage Your Settings - Personal Details'.
There it is, right below your birthdate.
A lot of spinning circles and you'll probably need to log in with a password a couple of times on random points, but you'll end up with your barcode number.
If you get too frustrated I can send you my QR code for the North game as a screenshot - it'll get you in on the night and apparently a half-price carwash afterwards.