Webhooks vs. API Integrations: How Your Tools Stay in Sync

An API lets one system request information or perform an action in another system. A webhook sends a notification when an event occurs, such as a completed form or updated payment. They are complementary: an integration can receive a webhook, verify it, fetch the current record through an API, and apply the next business rule. Think of the webhook as the doorbell; you still check who rang before letting the event into your workflow.

Choose how the integration learns about changes

Polling frequency, provider limits, and notification support depend on the actual service. Verify those details before promising instant updates. A business workflow should show when information was last checked so an operator can distinguish a current record from a delayed copy.

Example: a payment update creates a project task

An illustrative onboarding workflow waits for a payment update before opening a kickoff task. The integration receives an event, checks its authenticity, and finds the correct client transaction. It then verifies the relevant state and creates the task once. If the provider delivers the event again, the integration should recognize the existing work rather than create a duplicate task.

Stripe documents that webhook events can arrive more than once and are not guaranteed to arrive in order. GitHub likewise recommends handling webhook deliveries with security and recoverability in mind. Treat event delivery as an input to a controlled process, not an instruction to repeat an action blindly. Stripe reference GitHub reference

Define the integration contract

1. 01

   Choose the authoritative record

   Name which system owns each field. Avoid having two tools overwrite each other without a conflict rule.

2. 02

   Identify events and records

   Keep provider event IDs and the business record IDs they refer to. Decide how repeated delivery is recognized.

3. 03

   Separate receipt from completion

   Store the incoming work safely and process it with visible status. A received notification does not mean the downstream task succeeded.

4. 04

   Reconcile and recover

   Periodically compare important states and provide a controlled retry path. Make missing permissions, expired connections, and failed updates visible to an owner.

Ask what happens when the connection breaks

• The same event is delivered twice.
• An older event arrives after a newer one.
• The receiving system is temporarily unavailable.
• A provider account loses permission or its connection expires.
• A customer record was deleted or merged before the update arrived.

The operator should be able to see what failed, whether anything changed, and which retry is safe. Replaying an event must not mean recharging a customer, sending the same message again, or creating repeated work. Design each action with its own duplicate and recovery rule.

Measure the business result of synchronization

Track time from source change to confirmed destination update, unresolved failures, duplicate records, and manual corrections. Test whether the promised downstream outcome happened, not just whether an endpoint returned success. Start with one important connection before adding a network of automations that depends on it.