To pay for travel on AirportlinkM7 or any toll road in Queensland you'll need to buy a pass or open an account.
If you've already travelled you can buy a road pass within 5 days of your first trip. You can also backdate your travel up to 9 days after your first trip when you open a pre-paid account.
If you've received a toll invoice you can pay a toll invoice or demand notice online.
If you're planning future toll road travel you can open an account or buy a road pass. A Linkt account will cover you for trips on any Australian toll road.