Google had a very successful payments app called Tez in India. They merged that into Google pay during a flutter rewrite so that they can say things like “Google pay has 200 million users in 120 countries” even though all 200 million of those were in India.
In India, Google pay is a client for the UPI platform. You could send money from Google pay to Whatsapp pay for example.
The documentation has nothing to indicate that it is.