I want to accept Bch for my window cleaning business

I want to accept Btc cash for my window cleaning business but my pricing will be in fiat.

I used to call them up and take a payment over the phone. That won't work here so what's best?

.is there a way to have a button on a website that links to my customers wallet and sets up a transaction from them to me for the amount of their bill?

Would they be able to add a message or tag to their payment I.e Dave Davidson 123 any street?