During the planning stages of your flight, look up each potential refuelling location in ERSA and see what forms of payment they'll accept.
Airport bowsers accept many but not all credit cards as payment. Make sure to carry a credit card as well as carnet cards including World Fuel, Skyfuel and Air BP.
You may land at aerodromes where these payment options aren't available.
Always check the ERSA before you leave home. That way you can load any required payment app onto your phone and link it to a credit card. Also make sure you read the fine print for any potential call-out fee!
Fuel prices in the outback can be hefty enough without an unexpected bonus for the refueller added to your bill.