Card details
Test mode — no real money.
Card 4111 1111 1111 1111 ·
any future expiry · any CVV ·
postcode 10001
Square takes the postcode format from the card's country, and that test card is
American — so it wants a 5-digit US ZIP. A real Australian card asks for a 4-digit
postcode as you'd expect.
Your card is handled by Square. We never see or store the number.