SmartObject OData API

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Uri _baseUrl = new Uri("https://[environmentid]/api"); //TODO: replace with your K2 environment's URL
string _clientId = "3cb1141a-a226-497d-a512-8a4a2e512aec"; //Application ID of the client requesting the token (K2 API app, in this case)
string _authority = "https://login.microsoftonline.com/common/login"; //Login URL for AAD Instance
string _redirectUri = @"https://api.k2.com/client"; //Address to return to upon receiving a response from the authority
string _webApiResourceId = @"https://api.k2.com/"; //Identifier of the target resource that is the recipient of the requested token
string _resource = "/odata/v3/"; //the endpoint you want to query (in this case, all SmartObjects that have at least one list method are returned)
//string _resource = "/odatav4/v4/"; // this is the OData v4 endpoint

//set up http client
System.Net.Http.HttpClient _httpClient = new HttpClient(new HttpClientHandler()
{
    UseDefaultCredentials = false,
});

//platform specific arguments and information
Microsoft.IdentityModel.Clients.ActiveDirectory.PlatformParameters parameters = new PlatformParameters(PromptBehavior.Auto);
//retrieves authentication tokens from Azure Active Directory and ADFS services
Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationContext authContext = new AuthenticationContext(_authority);
Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationResult authResult = null;

try {
 //get the OAuth token (will show login screen to user if no token found)
 authResult = authContext.AcquireTokenAsync(_webApiResourceId, _clientId, new Uri(_redirectUri), parameters).Result;
} catch (Microsoft.IdentityModel.Clients.ActiveDirectory.AdalException adalEx) {
 //TODO: do something with the auth error
 return;
}

//use pathos client to construct the HTTP request and read response
Pathoschild.Http.Client.IRequest request = null;
Pathoschild.Http.Client.IResponse result = null;

request = (Pathoschild.Http.Client.IRequest) new Pathoschild.Http.Client.FluentClient(_baseUrl, _httpClient).GetAsync(_resource).WithHttpErrorAsException(false);
//pass in the access token that was obtained
request = request.WithBearerAuthentication(authResult.AccessToken);
result = request.AsResponse().Result;
//get the result form the endpoint call
string returnvalue = result.Message.Content.ReadAsStringAsync().Result;