shipbob-webhooks

ShipBob Webhooks

When to Use This Skill

• Setting up ShipBob webhook handlers
• Debugging ShipBob signature verification failures
• Understanding ShipBob event types (topics) and payloads
• Handling fulfillment, shipment, return, receiving (WRO), or billing events

Verification (core)

ShipBob signs webhooks with the Standard Webhooks scheme (the same fields Svix uses). It sends three headers — webhook-id, webhook-timestamp, and webhook-signature — and the event topic in a separate x-webhook-topic header (e.g. order.shipped).

The signature is HMAC-SHA256(secret, "{webhook-id}.{webhook-timestamp}.{body}"), base64-encoded. The signing secret is whsec_<base64> — strip the whsec_ prefix and base64-decode the remainder to get the raw HMAC key. Always verify against the raw, unmodified request body (don't JSON.parse first). webhook-signature holds space-delimited versioned signatures (v1,<sig>); compare against the v1 entry with a timing-safe comparison.

Node (via the standardwebhooks package, which handles the secret decode and multi-signature parsing for you):

const { Webhook } = require('standardwebhooks');

const wh = new Webhook(process.env.SHIPBOB_WEBHOOK_SECRET); // whsec_...
// rawBody is a Buffer/string; headers use the Standard Webhooks names
const event = wh.verify(rawBody, {
  'webhook-id': req.headers['webhook-id'],
  'webhook-timestamp': req.headers['webhook-timestamp'],
  'webhook-signature': req.headers['webhook-signature'],
}); // throws WebhookVerificationError on tampering or a stale timestamp
const topic = req.headers['x-webhook-topic']; // e.g. "order.shipped"

Python (manual — there is no official ShipBob SDK):

import hmac, hashlib, base64

def verify(body: bytes, webhook_id, webhook_timestamp, webhook_signature, secret):
    signed = f"{webhook_id}.{webhook_timestamp}.{body.decode()}".encode()
    key = base64.b64decode(secret.split("_", 1)[1])  # strip 'whsec_' then base64-decode
    expected = base64.b64encode(hmac.new(key, signed, hashlib.sha256).digest()).decode()
    sent = [s.split(",", 1)[1] for s in webhook_signature.split(" ") if "," in s]
    return any(hmac.compare_digest(expected, s) for s in sent)  # timing-safe