.net and .net core client for Vipps Login
VippsLoginManager vipps = new VippsLoginManager(VippsEnvironment.Prod, "client_id", "client_secret", "redirect_url");
vipps.SetScope("name phoneNumber");
var url_to_init_login = vipps.GetRedirectUrl(); //this process will output the auth_code used below
var token = await vipps.GetToken("authorization_code_from_last_step");
var userinfo = await vipps.GetUserInfo();
https://www.nuget.org/packages/Gressquel.Vippslogin/
can be found by searching in visual studio for "vipps" also