Email I just got:
Due to the costs associated with Visa transactions, beginning 1 November 2021, Amazon will apply a 0.5% surcharge to purchases made using Visa credit cards on Amazon.com.au. You can avoid the surcharge by using any debit card, Zip, or any non-Visa credit card like a Mastercard, Amex, or UnionPay card. Additionally, we are working to add more, faster and cheaper payment options for customers.