https://www.theverge.com/google/2018/5/25/17393618/paypal-gmail-youtube-google-g-pay

PayPal is continuing its deep integration with Google Pay, allowing users to pay for items and services without ever exposing sensitive information or the extra step of logging in and leaving G Pay, as spotted by TechCrunch.

Keep in mind, there’s already PayPal support in G Pay. You can pay for items at a brick-and-mortar store using your PayPal account if it’s connected to your Gmail without ever having a physical card.