Google pay is secure
I am a very satisfied user of the old Google wallet, android pay/Google wallet and now Google pay. I have been using nfc transactions for more than 5 years without any side effects. Your card number is never used. There is a pseudo number used in place of the real card number. It works amazingly well. I have used the wallet app to securely send money to friends and family very often and they get payment at the speed of light and can convert to cash with little trouble. All of this when Apple pay was not even thought of yet. I have used for credit, debit and loyalty cards. My bank was an early pioneer in nfc transactions. I can assure you that it is secure,encrypted, and password protected.