Business · Live
E-Way Bill Part-B Update API
Attach or change the vehicle and transport details on an existing bill.
What the Update Part-B API does
Update Part-B on an e-way bill — the vehicle number, transport mode and transporter document — after the bill has been generated. Required whenever a vehicle changes mid-journey, which is the most common reason an otherwise valid bill is challenged. Calls carry your own GST portal API credentials (GSTIN, username and password), so filings are made as you, on your own registration. We never file on our own account.
Popular use cases
- →Transport management systems recording vehicle changes in transit
- →Fleet operators reassigning consignments between vehicles
- →Logistics platforms completing Part-B after a dispatch is loaded
curl -X POST https://apisathi.in/gw/v1/ewb-update-partb-v1/ \
-H "X-API-Key: live_xxx" \
-H "Content-Type: application/json" \
-d '{ "gstin": "23BEFPJ5660F2ZP", "username": "your_portal_user", "password": "•••", "payload": { "ewbNo": 391000123456, "vehicleNo": "MH12AB1234", "reasonCode": "1" } }'{
"success": true,
"data": { "ewayBillNo": 391000123456, "vehUpdDate": "31/08/2026" }
}Frequently asked questions
Why does Part-B matter?
A bill without valid Part-B details is treated as incomplete in transit. Updating it whenever the vehicle changes is what keeps the consignment compliant.
How many times can I update it?
As often as the journey requires — each update is a separate call at ₹3.
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