Facebook Messenger might have a friend-to-friend payment feature in the future, and it was discovered by Stanford student Andrew Aude.

The hidden feature was discovered using Cycript, an app exploration tool for developers.

Aude started digging after seeing a screenshot from Jonathan Zdziarski's security research into the app.

He found a full-fledged app waiting to be made public.

This is what Kakao Talk is doing already. Are they following suit?