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Many developers ship apps with weak webhook security. They try to verify webhooks. It fails. They remove the check to fix the error. Now your app has a security hole.
Without verification, people send fake data to your endpoint.
- Fake orders
- Fake customers
- Corrupt CRM data
- Server crashes
Shopify signs the raw body using HMAC-SHA256. It puts the signature in the header. You must repeat this process on your server. Compare your result with the Shopify header. If they match, the request is real.
Common mistakes:
- Body parsing middleware. It changes raw bytes. Your signature fails. Use raw body buffers.
- Standard string comparison. This allows timing attacks. Use constant-time comparison functions.
- Ignoring timestamps. Old payloads still work. Reject requests older than 5 minutes.
- Skipping shop domain checks. Check the shop domain against your database.
Secrets management: Store secrets in environment variables. Never commit them to git.
Reliability: Respond with 200 OK immediately. Process the data in the background. Slow responses cause Shopify to retry. Retries lead to double processing.
Your checklist:
- HTTPS only
- Raw body buffers
- Constant-time comparison
- Timestamp check
- Shop domain check
- Secrets in env variables
- Async processing
Source: https://dev.to/masadashraf/how-to-verify-shopify-webhooks-correctly-and-stop-getting-it-wrong-1mbm