web-api-accept-json.cs

// Other using statements...

using Newtonsoft.Json.Linq;

// POST: api/AttendancesAPI/AddOrEditMultiple
[HttpPost, Route("api/AttendancesAPI/AddOrEditMultiple")]
[ActionName("AddOrEditMultiple")]
public HttpResponseMessage AddOrEditMultiple([FromBody]JToken attendanceProxy)
{
    // JToken as a parameter type allows us to accept JSON
    // We can then deserialise manually and handle errors
    try
    {
        AttendanceProxy ap = attendanceProxy.ToObject<AttendanceProxy>();

        // ...

        return Request.CreateResponse(HttpStatusCode.OK);
    }
    catch (Exception ex)
    {
        return Request.CreateResponse(HttpStatusCode.InternalServerError, ex.Message);
    }            
}