I am getting null value when request hitting to controller?

Question

I am developing Web API in dot net core 2.1. When i am passing the values through postman the request hitting to controller but the value is not getting

 

Below is my code

namespace MilkPos.API.Controllers
{
[Route("api/")]
public class HomeController : ControllerBase
{
IUser _IUser;
private DatabaseContxt _context;
public HomeController(IUser user,DatabaseContxt context)
{
_IUser = user;
_context = context;
}
//[Route("api/Order/{StatusId}/Status/{OrderId}/Order")]
[Route("GetOtp")]
[HttpPost("{id}")]
public ActionResult GetOtp(long id)
{
int otp = 0;
return Ok(id);
}
[Route("GetGeneratedOtp")]
[HttpPost]
public ActionResult GetGeneratedOtp(int Number)
{
return Ok(Number);
}
}
}

Form postman i am calling like:

 

http://localhost:8000/api/GetOtp/

 

Header

key content-type

value application/json

Body {"id":328432}

 

i am getting 0