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When paying with Flybuys Dollars, you need to present your physical Flybuys card and enter the PIN set up when loading your card. You can't use Flybuys Dollars via the barcode on the back of any credit card on which you can collect points (e.g. Coles Mastercard), or where you may have stored the Flybuys barcode digitally (e.g. the Flybuys app).