Do I need an internet connection to make payments through Google Pay?
A valid Token Key is required to make an Google Pay payment. Google Pay requires an internet connection to download Token Keys periodically. If you do not have an internet connection and have used all Token Keys on your device you will not be able to use Google Pay until new Token Keys have been downloaded.
After you connect to the internet, there may be a delay before Google Pay downloads new Token Keys to allow you to transact using Google Pay.