You will earn air miles with credit cards only if you make eligible purchases, yet each card issuers and various credit cards have different definitions on eligible purchases.
Some credit cards count only local and overseas retail purchases as"eligible purchases". Other spendings, like instalment amount, internet banking bill payment service, autopay service and Octopus automatic add value service, are excluded.
Please read and understand your credit card's terms and conditions to earn more air miles rewards.