If the authorized stay is for less than 90 days within 6 months (also applies to work authorizations for 120 days within 12 months), the entry visa is issued in form of a Schengen visa.
Documents to subit with your application:
Checklist Authorized visa less than 90 days (PDF, 2 Pages, 181.1 kB)
You must submit your application personally at VFS global, unless your fingerprints were collected within the last 59 month for a previous visa(*).
Where to apply for a Schengen visa
(*) the application can be submitted by mail to VFS global. However, it cannot be determined whether the quality of the biometric data allows copying of the fingerprints from a previous visa until the application is processed. For that reason a personal appearance at VFS global might still be required. Previously, email your Schengen visa stickers from the last 59 months together with your authorization to the competent Swiss representation to verify if your fingerprints can be copied.