Paid CIQ Apps

I've always offered my data fields at no cost. I enjoy writing them and get a lot of good feedback about the value. I just loaded a new watch face on my watch and actually like the way this guy handles his app... after a couple weeks, a little key flashes that encourages users to contribute a small tip for a code to turn off the key.

So I'm considering something like that. I've never setup a way to get paid. I just read someone's post about a "$99 Garmin Connect IQ Developer Account", and "Garmin’s Adyen Payment Portal". Sounds painful. If you've done something like that, is it working out for you? Any tips on landmines? I just saw this green banner on my account, so Step 1 must be good to go.