Instant Win 1 of 405,000 Prizes - Buy Slurpee from 7-11, Scan Barcode from App

See here for deal posting as well.

Apparently a 1 in 6 chance of winning

To be eligible to enter, eligible individuals must during the Promotion Period, either:

(a) purchase a physical Slurpee FlavourFest promotional wristband (“Wristband”) from any 7?Eleven store within NSW, ACT, QLD, VIC or WA (“Participating Store”) and then visit www.Slurpeeflavourfest.com.au (“Website”) and follow the prompts to register for the promotion by completing and submitting the registration form including the unique barcode from their Wristband, or they may register their Wristband via the App (as per instructions in clause 6(b) below); OR

(b) download the 7-Eleven Slurpee App (“App”) on their compatible smart phone device, and follow the prompts via the App to register for the promotion by completing and submitting the registration form. For the sake of clarity, a Wristband purchase is not mandatory to register via the App. However, a person who has purchased a Wristband may still register via the App.

To enter, eligible individuals must then during the Promotion Period purchase any Slurpee from a Participating Store, and have either their Wristband, or the promotional barcode accessible on their App, scanned in-store at the time of purchase.