Scribbles for my bad memory

[HttpPost] 
public  IActionResult Fill([FromBody] dynamic data)
{
     string amount = data.amount.GetString();
}

 [HttpPost] 
 public  IActionResult Fill()
 {
      string dataStr = new StreamReader(Request.Body, Encoding.UTF8).ReadToEnd();
      var data = JObject.Parse(dataStr);
      string amount = data.value.amount;
 }

[HttpPost] 
public  IActionResult Fill([FromBody] YourType data)
{
    string amount = data.amount;
}