I am trying to applied for Swedish residence permit at https://www.migrationsverket.se/. However, it asks "Have you previously applied for visa, residence permit or work permit in Sweden? If so enter the previous case number at migrationsverket.se"
I have visited Sweden before applying for residence permit. However, I didn't know the case number of my previous visit. Where could I find this? In Schenegen visa sticker? Your help is admired