1Instead to formdata switch to raw(Json) and try the following
2
3{
4    "payment_mode":"Paytm",
5    "price":10,
6    "drop_time":"2021-09-10 10:30:00",
7    "pickup_time":"2021-09-10 11:30:00",
8    "booking_items":[ 
9        {
10            "luggage_id":1,
11            "qty":1
12        }
13    ]
14}