Authorization accepted but I cannot have the token and nor the APi key

Hi,
I’m a Df beginer and C# newbie, however I have to connect to a DF rest and send files, I succeed to log in but the response from the HttpRequest doesnt show any “token”, I must precise that I did not produce the APi but when trying it from the DF portal, the curl command shows a token and an Api.
Do someone will have pity on me ?
==> no code samples are available in C#