Schengen visas can be issued by any member state of the Schengen Area. Travellers must apply to the embassy or consulate of the country which they intend to visit. In cases of travellers visiting multiple countries in the Schengen Area, travellers must apply to their main destination's embassy or consulate. If the main destination cannot be determined, the traveller should apply for the visa at the embassy of the Schengen member state of first entry. Often, external service providers are contracted by certain diplomatic missions to process, collect and return visa applications.