This shouldn't involve any coding and most of this can be set up from right within voltage.

This is what we build nodeless for, it's like btcpayserver but all the node stuff and liquidity management is pulled out.

Depends on your needs. I’d say they’re geared more toward small vendors/businesses, so if your needs are more complex then something like BTCPay server would be more robust. But then you get into node and liquidity management, although there are some companies like Voltage that have started offering solutions for that. Opennode is good for ease of use and conversion to USD and deposits to your bank. For what it’s worth with the Breez app, it runs a node on your mobile device so it’s self-custodial and doesn’t require any other device/node. By default it uses Breez’s LSP, but you have the option of connecting it to any other node you want. It has an integrated point of sale interface with NFC support, and Breez automatically manages channel liquidity for you (with associated fees of course when channel open/close occurs). It’s also primarily a lightning app. You can send and receive on chain, but you incur a swap fee when you do. Like I said just depends on your needs. Breez is perfect for a small/simple business that just needs a simple lightning point of sale. But I wouldn’t choose it if my needs were more complex.