The functionality is available directly inside the app, where you can simply tap Add Google Wallet to skirt around entering your credit card number manually, assuming you already have one saved to your Google account. If you've bought something from the Play Store without using a gift card, then that's more than likely a yes.
Google Wallet will show up as your default form of payment, but you can still use alternatives if you so choose. The app will let you pick between them at the end of a ride. Then you can hop out and go about planning when you will order your next one.
- Lyft blog