ProblemDetails.cs

public class ProblemDetails
{
    public ProblemDetails()
    {
    }

    [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "type")]
    public string Type { get; set; }

    [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "title")]
    public string Title { get; set; }

    [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "status")]
    public int? Status { get; set; }

    [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "detail")]
    public string Detail { get; set; }

    [JsonProperty(NullValueHandling = NullValueHandling.Ignore, PropertyName = "instance")]
    public string Instance { get; set; }

    [JsonExtensionData]
    public IDictionary<string, object> Extensions { get; }
}