Denny's typically accepts a variety of payment methods to accommodate its customers. These usually include cash, major credit cards such as Visa, MasterCard, American Express, and Discover. Additionally, many locations may accept debit cards that have the Visa or MasterCard logo. Some Denny's establishments may also accept mobile payment options and restaurant-specific loyalty or gift cards, though availability can vary by location. It is important to note that certain payment methods may be subject to local or state regulations, which could impact what each restaurant chooses to accept. For precise information regarding payment options at a specific Denny's location, it is advisable to check the current web page or inquire directly with the restaurant you plan to visit.