Answer
Security is key, so when using your Google Pay, you can rest assured that your card data is safe.
Google Pay does not share your real card details, it replaces them with a series of virtual numbers. When you add your ZEN card to Google Pay, a token generation request is sent. ZEN generates a token and Google Pay will encrypt your card details.
Using a ZEN card in the Google Pay application is not only fast but above all - safe.