If You merely system to visit just one Schengen country during your excursion, wherever to apply is pretty easy: you need to apply with the visa of that state you intend to visit. One example is, if you’re only going to Germany, then apply for any German Schengen visa.
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United kingdom applicants who would like to continue to be for a longer time than 90 days in Spain need to contact the embassy or consulate of Spain in britain and check with them with regards to the requirements or the type of visa they should apply for to remain more time than ninety days in Spain