Inviting friends to use Google Pay can bring you up to $100 of Play Store credit

The referral program is available in a number of countries, including Australia, the UK, Russia, the US, and more, but keep in mind you need to be 18+ to participate and you have 28 days to spend the promotion money in the Google Play Store. If not, they will disappear, making all your efforts worthless.
There's also another promotion regarding Google Pay. It involves making purchases using the app on 5 different days and each time you do it, you'll be granted $10 for a maximum of $50.
source: Google via Android Police

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