Classesfor below Json Data

you can do it manually or quick way using the below link 

https://json2csharp.com/

JSON :
"order_number": "#001",
"shipping_charges": 40,
"discount": 100,
"cod_charges": 30,
"payment_type": "cod",
"order_amount": 1000,
"package_weight": 300,
"package_length": 10,
"package_breadth": 10,
"package_height": 10,
"consignee": {
    "name": "Customer Name",
    "address": "190, ABC Road",
    "address_2": "Near Bus Stand",
    "city": "Mumbai",
    "state": "Maharastra",
    "pincode": "400001",
    "phone": "9999999999"
},
"pickup": {
    "warehouse_name": "warehouse 1",
    "name" : "Vikalp Sharma",
    "address": "140, MG Road",
    "address_2": "Near metro station",
    "city": "Gurgaon",
    "state": "Haryana",
    "pincode": "122001",
    "phone": "9999999999"
},
"order_items": [
    {
        "name": "product 1",
        "qty": "18",
        "price": "100",
        "sku": "sku001"
    }
]

Class
 

// Root myDeserializedClass = JsonConvert.DeserializeObject(myJsonResponse);
    public class Consignee
    {
        public string name { get; set; }
        public string address { get; set; }
        public string address_2 { get; set; }
        public string city { get; set; }
        public string state { get; set; }
        public string pincode { get; set; }
        public string phone { get; set; }
    }

    public class OrderItem
    {
        public string name { get; set; }
        public string qty { get; set; }
        public string price { get; set; }
        public string sku { get; set; }
    }

    public class Pickup
    {
        public string warehouse_name { get; set; }
        public string name { get; set; }
        public string address { get; set; }
        public string address_2 { get; set; }
        public string city { get; set; }
        public string state { get; set; }
        public string pincode { get; set; }
        public string phone { get; set; }
    }

    public class Root
    {
        public string order_number { get; set; }
        public int shipping_charges { get; set; }
        public int discount { get; set; }
        public int cod_charges { get; set; }
        public string payment_type { get; set; }
        public int order_amount { get; set; }
        public int package_weight { get; set; }
        public int package_length { get; set; }
        public int package_breadth { get; set; }
        public int package_height { get; set; }
        public Consignee consignee { get; set; }
        public Pickup pickup { get; set; }
        public List order_items { get; set; }
    }