All of the service methods accept an optional RequestOptions object. This is used if you want to pass the access key, headers on each method, or you want set type of return value (default type is string, if you want type of object use IsJson=true)

var requestOptions = new RequestOptions();
requestOptions.AccessKeyId = "ACCESS KEY ID";
requestOptions.SecretAccessKey = "SECRET ACCESS KEY";
requestOptions.ApiBase = "API BASE";
requestOptions.IsJson = true;

Now, you can use SDK to get or set values.