In LoginAPI class, method
///
/// Get token API This API provides the functionality to obtain opaque token from authorization_code exchange and also provides the user’s profile in the same response.
///
/// Thrown when fails to make API call
/// API Version Header
/// (optional)
/// (optional)
/// (optional)
/// (optional)
/// (optional)
/// TokenResponse
public TokenResponse Token (string apiVersion, string code = null, string clientId = null, string clientSecret = null, string redirectUri = null, string grantType = null)
uses apiVersion arguement. What is it? Where to find the version?