Generally, they are valid for any Groupon purchase, but check the terms if you received them through a specific promotion. Explain how to refer a friend to get $10? Help you find a specific local deal ? Let me know what you'd like to do next!
You cannot apply Groupon Bucks to the purchase of gift cards.
This article explains how to acquire and use Groupon Bucks, a form of store credit designed to streamline purchases on the platform. How to Acquire and Use Groupon Bucks: A Comprehensive Guide