Mi paghi una birra.

English Translation

Pay me a beer.

How this one compares in usage to “buy me a beer” ? Also, the phrase “I invite you” means “I offer to pay for you” in one part of the world and not in the other part of it. Interesting.

Wordreference.com shows as an alternate meaning that pagare can mean “to buy” or “to treat” - also “to bribe” so it seems to be a very fluid verb!