There are many options for a business to accept BTC as a payment. Maybe @DarthCoin has a guide about it.
If you want to be owner or to have the custody of the BTC, you'll need a LN node.
But, if the priority is to start you can do it for example with Wallet of Satoshi that it includes a Point of Sales, so the staff can charge the customer and it can be configured to only one wallet (manager) be able to spend from the wallet.
Coinos is a great option too. It just need to create an account on their site.
Yes, here it is the guide for Zeus, that is used by Pubkey https://darthcoin.substack.com/p/getting-started-zeus-mobile
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