Whether you are applying for a loan, putting together a new-job file, applying for a scholarship or checking how many premium days you have towards retirement, Turkish institutions usually ask for the same document: the SGK registration and service record. It lists when your social security coverage started, which employers paid premiums for you, how many days each covered, and your reported earnings, all in one file.
The good news is that you do not need to visit a Sosyal Güvenlik Kurumu office. You can produce the document yourself through the e-Devlet portal, and the file that comes out is barcoded, so whoever receives it can verify online that it really came from the state records. The steps below cover the "SGK Tescil ve Hizmet Dökümü / İşyeri Unvan Listesi" service. It is free and takes a couple of minutes.