curl --request POST \
  --url https://api.sandbox.co.in/gst/compliance/e-way-bill/consignor/bill/{ewb_no}/multi-vehicle/vehicle \
  --header 'Content-Type: application/json' \
  --header 'authorization: <authorization>' \
  --header 'x-api-key: <x-api-key>' \
  --data '
{
  "ewbNo": 291010080003,
  "groupNo": "1",
  "quantity": 15,
  "transDocDate": "12/10/2017",
  "transDocNo": "1234",
  "vehicleNo": "PQR1234"
}
'

{
  "code": 200,
  "data": {
    "alert": null,
    "data": {
      "ewbNo": "291010080003",
      "groupNo": "1",
      "vehAddedDate": "13/05/2024 04:19:00 PM"
    },
    "status": "1"
  },
  "timestamp": 1763446641000,
  "transaction_id": "b0eb7094-2825-4fae-8b1b-79771a41a65a"
}