1) Google Pay will never sell your information.
2) Specifically, Google Pay will never sell your transaction history to third parties
3) Or share it with the rest of Google for targeting ads.
Before trusting them with your financial data, just remember the long list of broken promises they did before!
for example: * Gmail that was supposed to be unlimited for free for ever until they reached dominance; * same with google photo unlimited storage; * Google music that suggested you upload all your musique; * Android that is more and more closed and limited years after years; * The Google cars secretly collecting wifi data * The "don't be evil" not annoyed to create a censured search engine for China * The geolocation data that was deceptively recorded and kept, and provided to the police for geofencing for the US * The company that closes and blocks accounts for futile reasons without any 'human' support if don't have social media fame.
I'm not sure why you assume anything about my trust with Google?
So he's being very misleading here, likely deliberately. They don't directly share it with the rest of Google, but indirectly your Google Pay data is still laundered through shady Mastercard deals to Google's ad behemoth anyway.
Google Pay -> Data laundered through Mastercard -> Google Ads