Define the workflow before writing code
Map the business event
Write the trigger, source system, destination system, required fields and expected outcome. For a CRM-to-finance handoff, decide which stage creates a customer or invoice and which events should only update an existing record.
Define failure and reconciliation paths
List what should happen when the destination API is unavailable, the data is incomplete or an update arrives before its related record. Document how a team member can identify and resolve an exception without manual database edits.
Use safe authentication and payload handling
Verify authenticity and permissions
Keep API keys and OAuth refresh tokens in supported secret storage, not HTML. Where the sender supports signed webhooks, validate the signature and a reasonable timestamp window. Use scoped service accounts and rotate credentials as needed.
Validate before persisting
Check required fields, allowed status values, correct data types and resource ownership. Reject unexpected or malformed requests. Keep sensitive customer information out of unnecessary logs and never use a public GET URL to pass private lead details.
Make delivery idempotent
Assign an event or operation ID
Use a stable event ID as a deduplication key. A sender may retry the same notification after a timeout even when the first attempt succeeded. Persist the processed event ID or destination record ID so a repeat does not create a second order or invoice.
Handle ordering and concurrent requests
Two updates can arrive out of order. Compare version numbers or updated timestamps where the source supports them, and use appropriate locking for competing writes. Design for at-least-once delivery rather than assuming every webhook arrives exactly once.
Plan rate limits and recovery
Separate immediate acknowledgement from longer tasks
Where your infrastructure permits, validate and queue the event before responding quickly to the sender, then process it with retries and backoff. If you cannot queue tasks, document timeout behaviour and ensure replay is safe.
Measure the right signals
Track successful, retrying and permanently failed events; processing latency; error reasons; and record count reconciliation. Alert on sustained failure rather than on every transient glitch. Add an operational playbook with the correct owner.
Test real-world edge cases
Simulate network failures and replays
Test duplicate event delivery, timeouts after a successful write, expired tokens, 429 rate limits, malformed payloads, missing foreign keys and partial updates. Verify that retrying a request does not create a second record.
Use staged rollout and controlled access
Start with sample records and a non-production destination where possible. Confirm business approvals, monitor early traffic and keep rollback options. Retain only the audit data required to investigate genuine failures.
Implementation checklist
Use these checks to review your own project before launch.
- Source event and destination action defined
- Credentials stored securely and scoped
- Input validation and signature check specified when supported
- Deduplication identifiers and retries implemented
- Logging and monitoring available without secret exposure
- Replay, failure and reconciliation tests completed
Frequently asked questions
Is a webhook the same as an API?
An API is an interface used to request or change data; a webhook is typically an event-driven HTTP notification sent when something happens. Many integrations use both.
Can one event safely trigger more than once?
Yes, when the receiver uses idempotent processing. Repeated delivery is normal in reliable integrations; the same event ID must not produce a duplicate business record.