public class Payload
{
   public string Value1 { get;set;}
   public JObject InnerPayload { get; set;}
}

var jsonData =
"{
 "Value1": "some value",
 "InnerPayload": { "x": "x1", "y": "y1", "array": ["v1", "v2"] }
}"; //assume it with proper string escaping

var payload = JsonConvert.DeserializeObject<Payload>(jsonData);