public Task <Order> GetOrderAsync(Guid walletId, Guid orderId)
        {
            if (walletId == Guid.Empty)
            {
                throw new ArgumentException("walletId");
            }
            if (orderId == Guid.Empty)
            {
                throw new ArgumentException("orderId");
            }

            var request = new GetOrderMessageBuilder(walletId, orderId);

            return(SendAsync(request).ReadAsAsync <Order>());
        }
		public Task <Order> GetOrderAsync(Guid walletId, Guid orderId)
		{
			if (walletId == Guid.Empty)
				throw new ArgumentException("walletId");
			if (orderId == Guid.Empty)
				throw new ArgumentException("orderId");

			var request = new GetOrderMessageBuilder(walletId, orderId);
			return SendAsync(request).ReadAsAsync<Order>();
		}