This article is misleading 
> ‘Boycott’: Online fury at Froth Brewery Perth’s no-cash rule
>  >The Australian Competition and Consumer Commission states “businesses do not have to accept cash” and can choose which payment method they prefer. 
https://www.news.com.au/finance/money/boycott-online-fury-at-froth-brewery-perths-nocash-rule/news-story/737131d896554b3f889f47c7dd6b7235

I can imagine this happens:

> Card surcharges
>  >In general, businesses can charge a surcharge for paying with a credit, debit or prepaid card, but there are rules around what businesses can include in calculating these costs.
>  >If there is no way for a consumer to pay without paying a surcharge, the business must include the minimum surcharge payable in the displayed price for its products.
https://www.accc.gov.au/business/selling-products-and-services/payment-methods