<http 401 unauthorized retrofit kotlin> I'm trying...

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http 401 unauthorized retrofit kotlin
I'm trying to pull data by connecting to a web service using Retrofit. I can extract data from an unencrypted web service with the codes I use. The web service I will use in my application is encrypted. so i get this error : "http 401 unauthorized" . In Postman I can access the data by entering name and password. I couldn't find the code despite searching a lot. Can you help?
example web service auth name : "exampleusername" , password : "examplepassword"
object RetrofitBuilder {...