I guess so? I still don't really get why Bob/Carol can't just pay Alice through invoice generated through Alice's LNC connection into some database on magicwebstore's backend, BUT...You would have to look at the alby dev docs. It seems backwards than how it is commonly used, which as a payer tool, not a payee tool, but it could be both maybe. As you know Lnbits is kind of the go-to for webhook stuff though. I personally would use BTCPay on Alice's end but regardless I like the project and I like the vision and hope you find the solution you need!