If you have a website where you are selling things. nostr:nprofile1qqsv8fus0eeygg3k4mzlv9y5j9x5jka6pzvyfgkcyrug38hmutnfd5spzdmhxue69uhhwmm59e6hg7r09ehkuef0kq8wgf offers a payment processor where you can accept fiat or Bitcoin. Either on chain or lightning. Simplifies the process, and keeps track for you.