Virtual Webhooks vs Polling Jobs: How Integrations Handle Change Detection
March 30, 2026
Most teams think they're choosing between webhooks and polling.
They're not.
They're choosing how change detection works under the hood—and that decision determines latency, system complexity, and whether your 'real-time' features actually behave as expected.
The problem is that 'webhook support' is used to describe very different event delivery models.
For a full comparison of unified API platforms and how they implement these models, see: Which Unified API Platforms Support Virtual Webhooks vs Sync-Based Notifications?
How integrations handle missing webhooks
Native webhooks
This is the simplest model.
- The source API detects a change
- It sends an event immediately
- Your application processes it
Examples include payments, ecommerce orders, or Git events.
The limitation is coverage. Many SaaS APIs don't support webhooks consistently, and some don't support them at all.
When native webhooks are not available
Virtual webhooks (detect changes → deliver events)
This is how platforms like Unified handle integrations without native webhook support.
Under the hood:
- The integration layer polls the source API
- Detects changes using timestamps, cursors, or diffs
- Delivers events to your webhook endpoint
Your application subscribes once and receives events without running polling jobs.
The important detail:
Polling still exists—it's handled inside the integration layer instead of your application.
Freshness depends on how frequently changes are detected. That can mean minutes or longer intervals depending on the platform.
This directly affects whether your product reacts to changes quickly—or with noticeable delay.
Separate model: sync-based notification systems
This is where most confusion happens.
In this model:
- The platform runs a scheduled sync
- Stores records in its own environment
- Sends a webhook after the sync completes
These are not event-driven change detection systems.
They are notifications tied to a batch process.
In most cases:
- The webhook does not include updated records
- Your application retrieves data separately
In practice, your application reacts after the sync completes—not when the change actually happens.
Why this distinction matters
At a glance, these approaches can look similar. In production, they behave very differently.
Freshness
- Native webhooks → near immediate
- Virtual webhooks → depends on detection interval
- Sync-based systems → depends on sync cadence
If your feature depends on timing (alerts, automation, AI workflows), this difference is visible to users.
What your application actually receives
There are two common patterns:
Event with records
- Webhook contains updated data
- No follow-up request required
Notification only
- Webhook signals that something changed
- Your application retrieves data separately
If every event requires another API call, your system still needs retrieval logic, pagination handling, and retry logic.
Where polling lives
Polling does not disappear. It moves.
- In polling jobs → your application owns it
- In virtual webhooks → the integration layer owns it
- In sync systems → it runs as scheduled batch jobs
The real question is:
Do you want that logic in your application, or handled by the integration layer?
Data handling and system design
These models also differ in how data is handled.
- Sync-based platforms maintain stored copies of records
- Platforms like Unified retrieve data directly from the source API when events are generated
This affects:
- compliance scope
- latency
- long-term migration risk
What this looks like in your application
Two teams building the same feature can end up with very different architectures.
With sync-based notifications
- Receive notification
- Retrieve updated records
- Handle pagination
- Deduplicate data
- Manage retries
With virtual webhooks (records included)
- Receive event
- Process data
That difference compounds across integrations and objects.
The takeaway
'Webhook support' is not enough information.
What matters is:
- how changes are detected
- when events are delivered
- whether events include usable data
Virtual webhooks move change detection and delivery into the integration layer.
Sync-based systems notify your application after data has already been processed elsewhere.
That distinction determines whether your application is built around events—or around scheduled data retrieval.