He can register an account at coinos.io in a couple of seconds and join hundreds of other merchants using it to take retail lightning payments for free.

We'll list him on the map on our homepage and btcmap.org and start promoting him to the community in an effort to send some new business his way.

From his settings page he can generate a QR code linking to his coinos profile page which can be placed up at the cash register to direct customers there. See https://coinos.io/shawarmacorner as an example.

That way customers can generate an invoice, add a tip and pay all from their phone without him and his staff having to do anything.

We tell all our merchants to enter their bitcoin sales as "cash" transactions in whatever existing PoS and accounting software they already have in place. We track the CAD value of all transactions at time of sale and provide a CAD total of all payments for the day/week/month etc.

If he has a tablet or phone to check for payment confirmation, that's great, he can install the app on the homescreen as a PWA. Otherwise we'd be happy to ship out one of the custom thermal receipt printers we've been working on which provides a very easy paper receipt confirmation. See this video for more info: https://www.youtube.com/watch?v=JiGoOJZUrP8