What does the minimum purchase mean on restaurant com?

Each certificate also helps restaurants by setting a minimum purchase amount (before taxes and tips), attracting new customers and keeping restaurants busy. You can only use one certificate per restaurant per month (but that means you can use one certificate at each restaurant during your vacation). I read your comment that the restaurant has a different menu on the Internet than what is actually presented in the restaurant. And I read that most restaurants after buying them don't even accept them when you take them to the restaurant.