The providers usually have a donation button or payment page, right in their software or website.

For the backend stuff, just follow my Silberwitch account. We're working on making them more visible on our website. Here's a thread, for now: 
nostr:note1c9lnxwhp6m8f353j8sdyufenfd9v09v46qs390f8plfjgjuf9uzqs9x7mj