Good question, and for a merchant who doesn't care about crypto, the hard part is usually the cash-out, not the wallet. A self-custody phone wallet keeps the keys with the seller, but they will still need an exchange that pays out in AUD to turn coins into dollars, so check that route before recommending anything to customers. Stablecoins can avoid most of the price swings if the goal is to receive payments. If you want a simple phone wallet where the keys never leave the device, Super AI Wallet supports Ethereum, BNB Chain, Solana and Tron: app.superaiwallet.com/wallet
Jack — app.superaiwallet.com/wallet