This is the first time I've heard of this standard and it looks interesting, but it doesn't seem like the payment processing is well standardized. I see in the W3C draft that the "Interledger Protocol" should be utilized, but looking at the wallet limitations (https://webmonetization.org/wallets/#limitations) it seems like there are no wallets that allow cross-wallet payments. Is that something thats planned in the future, or will wallets be allowed to lock down who can pay who?