Set up High Mobility webhooks to receive fleet vehicle clearance-status change events instead of polling the Auto API
domain: high-mobility.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Configure a webhook under API Credentials -> Webhooks in the High Mobility dashboard, supplying an HTTPS-only callback URL and a shared secret
Subscribe to the fleet_clearance_changed event type to be notified when a fleet vehicle's clearance status changes
Handle the ping event type as well, since it fires whenever the webhook configuration itself changes
Verify incoming payloads using the X-HM-Signature-256 header (HMAC-SHA256 of the raw body), treating the older X-HM-Signature (SHA1) header as deprecated
Test the integration against High Mobility's emulator before relying on production OEM behavior
Known gotchas
The docs explicitly warn that production webhook availability differs per carmaker even though 'all webhooks work with the emulators' — reliable test behavior doesn't guarantee the same in production for every OEM
Only HTTPS callback URLs are accepted — an HTTP endpoint is rejected at configuration time
The legacy X-HM-Signature (SHA1) header still exists for backward compatibility but is deprecated — new integrations should verify against X-HM-Signature-256 only
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