GetOrderQueryHandler.cs

public class GetOrderQueryHandler : IRequestHandler<GetOrderQuery, OrderResponse>
{
    private readonly IOrderService _orderService;

    public GetOrderQueryHandler(IOrderService orderService)
    {
        _orderService = orderService;
    }
    
    public async Task<OrderResponse> Handle(GetOrderQuery request)
    {
        var orderResponse = await _orderService.GetByIdAsync(request.OrderId);
        return orderResponse;
    }
}