In November 2017, Google added money transfers to Android Messages using Google Wallet. Now hints on this feature appear in the Google Contacts application.
What is known
The feature is seen by one Canadian user who saw the corresponding icon after the application was updated. The interface remained the same as in Android Messages. The user also selects the contact he wants to send funds to, and enters the payment amount.
It is noteworthy that the user who discovered the new function could not use it. Perhaps it will become active when Google officially adds it in future updates.