Hi @Amanda70 👋
You can accept any Australian-issued and most international chip cards or magstripe cards with a Visa, Mastercard, American Express, and JCB logo, as well as bank-issued eftpos chip cards on Square hardware. While I'm not familiar with how Cards 4 All gift cards are set up, you would generally be able to accept gift cards that are associated with a card network, e.g a Visa or Mastercard gift card.
