It was always confusing for customers to use two different payment processors, one to make mobile payments game with Google Wallet and other for buying things with Android Pay.
Google now has finally merged Android Pay and Google Wallet into one payment processor and come up with Google Pay as a general purpose for online payment solution.
Google Pay is already running across several apps such as: Airbnb, HungryHouse, Dice, Fandango and Instacart.
All your info's on Google Wallet and Android Pay will automatically be transferred to Google Pay for which you do not need to worry.
Many more features are app support are expected to be added in the coming months.