Cashless Facebook Marketplace payments

I've bought a few items on Facebook Marketplace and have tried to avoid handling cash for my transactions.

I discovered that Messenger actually has an option to send payments via Paypal. It's just a feature that isn't used or very discoverable. (it's behind the little $ icon if you're wondering)

The idea behind this design is, what if you could surface that payment option based on the context of your conversation? This is much like an existing feature that says "create a plan or scheudle a meetup"