You can pay with your Currensea card using Google Pay for online transactions, and also for direct purchases. It will work anywhere that accepts contactless payments — this includes shops, transport, hotels, restaurants and other vendors worldwide. Rest assured that you don't need an internet connection to use Google Pay for in-store purchases.
Please note, you cannot add your card to Google Pay on your phone before you have received it. This is because you need to have activated the physical card before it can be added to Google Pay on your phone.