When you purchase a certificate from Restaurant.com, you're helping restaurants by setting a minimum purchase amount (before taxes and tips). This helps to attract new customers and keep restaurants busy. You can only use one certificate per restaurant per month, so if you're planning a vacation, you can use one certificate at each restaurant you visit. It's possible that the restaurant has a different menu online than what is actually presented in the restaurant.
Additionally, some restaurants may not accept the certificate when you take it to the restaurant. If you're concerned about whether or not a restaurant will accept your certificate, it's best to contact them directly before purchasing. This way, you can ensure that your certificate will be accepted and that the menu items you're interested in are available.