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