shipping rate

I also use external service "aramex" I am tring webhook but not working.

Thank you.

I don't know how Aramex works, but getting shipping methods/rates is different from setting up a shipment.  If they have an API to create a shipment, you would call that API after you create the shipment nopCommerce, so you could still do it in the Order Paid handler.

Ok, what is the different between webhook and orderpaid ?
Thank you.

Webhooks are "HTTP callbacks".  The allow external systems to call a method in your system/code.
The OrderPaidEvent is one of many events that are 'published' by nopCommerce code so that developers can 'handle' them.

Thank you, You are very helpful.

    public class EventConsumer : IConsumer<OrderPaidEvent>
    {
        public void HandleEvent(OrderPaidEvent eventMessage)
        {
            if (eventMessage.Order.PaymentStatus == PaymentStatus.Paid)
            {
                Debug.Write("Payment Status= Paid");
            }
            else
            {
                Debug.Write("Payment Status= Pending");
            }

        }
    }

I develop this code in shipment plugin, I assume it will run after payment provider page  redirect to my website in the last step "Complete Order", I update order Payment Status to paid if it is success in payment plugin and it is success but "EventConsumer " never invoke.
Thank you.

Test your handling of OrderPaidEvent by using a payment provider like CheckMoneyOrder, and then after order is confirmed, as an admin, mark the order as paid.

Thank you,

       //This not invoke the HandleEvent(OrderPaidEvent eventMessage)
        private readonly IOrderService _orderService;
        order.PaymentStatus = PaymentStatus.Paid;
       _orderService.UpdateOrder(order);

      //This invoke the HandleEvent(OrderPaidEvent eventMessage)
        private readonly IOrderProcessingService _orderProcessingService;
       _orderProcessingService.MarkOrderAsPaid(order);

Can I know why and what different ?

Because MarkOrderAsPaid calls ProcessOrderPaid which raises the event:
...
            //raise event
            _eventPublisher.Publish(new OrderPaidEvent(order));

Thank you very much your replies are very helpful.