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.

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

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

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