The EFAPI application (Online Delivery of Customs Files) is a command line application, which allows Economic Operators, Authorised Customs Clearance Entities and others, to send and receive files to and from the SFA system (Automobile Taxation System), STADA (System for the Automatic Processing of Customs Declarations) Import, Export and ECSDSS (Export ControlSystem - Exit Summary Declaration), via the Customs Portal of the AT - Tax and Customs Authority.