I think in one of clients it includes it in the monero Metadata.
rafael_xmr (nprofile…ph0l) Graham O'Nero (nprofile…r95v) boseph (nprofile…8fdh) are building the only monero clients as far as I'm aware, plus whoever made Garnet (A Monero fork of Amethyst but it stopped being developed).
I imagine the only way would be feasible are with view keys, or Wallet URI integration, and an event listener for when the monero tipping button is clicked, or scanned, who knows.
The coder boys know more about this more than I do.
