IMediator.cs

 public class AccountController : BaseController
    {
        private readonly IMediator _mediator;
    

        public AccountController(IMediator mediator)
        {
            _mediator = mediator;
        }

        [HttpPost("CreateUser")]
        public async Task<IActionResult> CreateUser(UserCreateCommand model)
        {

            var result = await _mediator.Send(model); // returns a bool value

            if (result)
                return Ok();

            return BadRequest();
        }
}