Studio 9 Salon Gratuity Policy: Gratuity’s to service providers at Studio 9 Salon are optional. If you would like to leave a gratuity for a service provider please use the following guidelines. Gratuities cannot be applied to charge cards or added to a personal check used to pay for salon services. You may leave a gratuity in the form of cash or personal check directly to the service provider as you wish. For your convenience we have provided envelopes for this purpose. An ATM can also be found in the lobby.