Amazon opened its first checkout-free store in early 2018, and it has said it could open as many as 3,000 cashierless Amazon Go stores by 2021. So far, most have been smaller convenience stores, but people have speculated that it’s only a matter of time before Amazon brings the cashierless checkout to large supermarkets. That said, it’s unclear how exactly Amazon will make that model work with the many items in a grocery store that need to be weighed before purchase, like fresh fruit and vegetables. But last month, Amazon confirmed that its engineers are testing Go tech at a 10,400-square-foot retail space in Seattle.

Amazon is notorious for trying multiple ideas at once, and just last week, the company said it plans to roll out another grocery store format. Supposedly, that model will be different from Whole Foods but will still have cashiers. Amazon is also considering licensing its cashierless tech to other retailers, like movie theaters, stadiums and airports.

Amazon did not immediately respond to a request for comment.

Nick Knight, CEO of Domino’s Australia and New Zealand, claimed it’ll cut lines in store and reduce delivery wait times (though that might be a stretch if customers pay by logging into their PayPal accounts at the counter). He also suggested the move will help protect employees, as delivery drivers and stores won’t carry any cash.

Australia is an intriguing testing ground for electronic-only payments. A study commissioned last year by the Australian Taxation Office found just a fifth of residents prefer using cash when they buy something, while 18 to 34-year-olds are more likely to ask for a discount when they pay with physical money. Meanwhile, Australians can no longer make cash purchases over $15,000 following a law that came into force this month.

Domino’s is aware some people will prefer to pay by cash though, whether due to convenience or because of privacy concerns. “We understand there are some options that will address these concerns,” a Domino’s spokesperson told the New Zealand Herald. “Customers will ultimately choose the payment method that suits their preferences.”

While cashless stores are effectively legal in Australia, other parts of the world are less welcoming to them. Stateside, Philadelphia and New Jersey have banned cashless stores, and some other jurisdictions, such as San Francisco, are considering a similar ban. Even Amazon Go stores, which were designed with cashless payments in mind, are accepting physical payments. Cashless stores can exclude people without bank accounts and those who are unable to or would prefer not to use prepaid debit cards, which charge fees much of the time.

Still, Domino’s has long been experimenting with various ordering and delivery options. You can order from some car touchscreens, while it’s tested drone and self-driving vehicle deliveries. So, trialing different payment options seems like a logical step for the company.

Cashless businesses can be efficient and convenient while acting as a barrier against robbers looking to steal a stack of bills. However, they can exclude people without a bank account or those who can’t or don’t want to load funds onto a prepaid debit card, which often charge fees.

“It just seemed to me unfair that I could walk into a coffee shop right across from City Hall, and I had a credit card and could get a cup of coffee. And the person behind me, who had United States currency, could not,” Councilman Bill Greenlee, a bill co-sponsor, told the New York Times. A spokesman for Mayor Jim Kenney, who signed the bill into law last week, noted to the Wall Street Journal that 26 percent of city residents are below the poverty line.

Similar legislation is under consideration in cities including New York, San Francisco, Chicago and Washington, DC. In New Jersey, the legislature has approved a bill which now just needs Governor Phil Murphy’s signature to become law. Massachusetts, meanwhile, has long required businesses to accept cash.

There are a few exemptions to the Philly law, namely parking garages and lots, online and phone transactions, retailers with a membership model (such as Costco) and companies where a credit card deposit is usually necessary, like hotels and rental car businesses.

There’s also a measure that could exempt stores like the cashierless Amazon Go chain. The provision allows cashless “transactions at retail stores selling consumer goods exclusively through a membership model that requires payment by means of an affiliated mobile device application.” However, Amazon reportedly told the city Go stores would still be affected, because consumers don’t have to be Prime members to shop there. They only need an Amazon account.