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Tabulated below are list of Symptoms and their respective Solutions

Symptom What to check
Subscription create returns 403 Merchant has enabled webhooks for that store handle
No event arrives Merchant switch on, subscription is_active, correct event name, reachable HTTPS URL
Authentication fails Developer api_key / api_secret and token expiry; do not use merchant browser tokens
Signature mismatch Raw body bytes, signing mode, secrets, header names, hex encoding
Duplicate business updates Idempotency; order.paid vs order.status overlap
Delivery times out Accept work durably and acknowledge within five seconds
Signing secret lost Call rotate-secret and update your receiver
Developer api_secret lost Contact Zencommerce support — registration secret is shown only once
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