Part-B Update API

What is the Part-B Update API?

The Part-B Update API updates the vehicle number, mode of transport, or transporter ID on an existing e-Way Bill. This is required (a) when a Part-A-only EWB needs vehicle details added before goods movement, or (b) when vehicle changes mid-journey (e.g., transhipment, breakdown).

Each EWB allows multiple Part-B updates throughout the journey. WhiteBooks tracks the full Part-B history per EWB for audit trail. The API also handles "Update Place of Delivery" for cases where the destination changes after EWB generation.

Quick spec

• Endpoint: POST /api/v1/eway/part-b/update
• Auth: OAuth 2.0 bearer token
• Production base: https://api.whitebooks.in/eway
• Sandbox base: https://apisandbox.whitebooks.in/eway
• Format: JSON in / JSON out
• SLA: 99.99% uptime · p95 < 350ms

Code examples

curl -X POST 'https://apisandbox.whitebooks.in/eway/api/v1/eway/part-b/update' \
  -H 'Authorization: Bearer YOUR_TOKEN' \
  -H 'Content-Type: application/json' \
  -d '{ /* payload */ }'

const res = await fetch('https://apisandbox.whitebooks.in/eway/api/v1/eway/part-b/update', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer ' + accessToken,
    'Content-Type': 'application/json',
  },
  body: JSON.stringify(payload),
});
const data = await res.json();

import requests

resp = requests.post(
    'https://apisandbox.whitebooks.in/eway/api/v1/eway/part-b/update',
    headers={'Authorization': f'Bearer {access_token}'},
    json=payload,
)
data = resp.json()

HttpRequest req = HttpRequest.newBuilder()
    .uri(URI.create("https://apisandbox.whitebooks.in/eway/api/v1/eway/part-b/update"))
    .header("Authorization", "Bearer " + accessToken)
    .header("Content-Type", "application/json")
    .post(BodyPublishers.ofString(payload))
    .build();
HttpResponse<String> resp = HttpClient.newHttpClient()
    .send(req, BodyHandlers.ofString());

Integrate in 3 steps

1. Sign up at accounts.whitebooks.in — sandbox credentials issued instantly, no sales gate.
2. Make your first call against the sandbox base URL using the code example above. Validate against your local model.
3. Move to production once your tests pass — switch host to https://api.whitebooks.in/eway. Same payload, same response shape.

Frequently asked questions

Explore the full e-Way Bill API

This is one endpoint inside the WhiteBooks e-Way Bill API suite. See the full documentation — every endpoint, every parameter, every error code.

Related e-Way Bill API endpoints