So i am not seeing a way to add paypal to google pay i followed the help on paypal and i do not see google pay anywhere. Both in google pay and paypal.
You can add PayPal to Google Pay through the Google Pay app or through the PayPal app. To add through the PayPal app tap the Settingsgear icon, then Google Pay, then Set it Up. To add though the Google Pay app go to the Cards tab and tap the+ symbol, select PayPal to add your PayPal account.