Oddbean new post about login | logout did you give the 'open wallet' button a shot? It's supposed to open your wallet extension with the same invoice. If you're on your phone, it'll take you to your wallet app with the invoice.
It was trying to open Electrum wallet, even though I have the Alby extension installed... so I think that depends on user/OS settings. Electrum has probably marked itself to my OS as "the bitcoin wallet". I had this same functionality on my own site working already, but it was through the Alby Lightning Publisher WP addon and it was causing other issues (backend kept crashing). Alby crew is looking into it, so I'm hoping to get my lightning donation buttons back online soon 😃