Modern applications increasingly depend on real-time communication between different systems. Whether it is a payment confirmation, order update, shipment notification, CRM synchronization, or third-party integration, businesses need reliable ways to detect and respond to changes in data.
Two common approaches for receiving updates from external systems are Webhooks and Polling. While both can keep applications synchronized, they work in very different ways and have different implications for performance, scalability, reliability, and infrastructure costs.
Choosing the right approach can help businesses reduce unnecessary API requests, improve application responsiveness, and build more reliable integrations.
What Are Webhooks?
A webhook is an event-driven mechanism that allows one application to automatically send data to another application when a specific event occurs.
Instead of repeatedly asking an external system whether something has changed, the receiving application provides a URL where the external service can send an HTTP request when an event happens.
For example, when a payment succeeds, a payment platform can send a webhook notification to the merchant’s backend.
Example:
- Customer completes payment.
- Payment provider processes the transaction.
- Payment provider sends a webhook.
- Your application receives the event.
- The order status changes to “Paid”.
What Is Polling?
Polling is a technique where an application periodically sends requests to another system to check whether new data or changes are available.
For example, an application may call an API every 30 seconds to determine whether an order has changed.
Example:
- Application requests order status.
- Server returns “Processing”.
- Application waits 30 seconds.
- Application sends another request.
- Server returns “Shipped”.
- Application updates the user interface.
Polling is simple and widely supported, but frequent requests can increase API traffic and infrastructure usage.
Webhooks vs Polling: Quick Comparison
| Feature | Webhooks | Polling |
|---|---|---|
| Communication Model | Event-driven | Request-driven |
| Real-Time Updates | Excellent | Limited by polling interval |
| API Requests | Only when events occur | Repeated requests |
| Infrastructure Efficiency | High | Lower for frequent polling |
| Implementation | Moderate | Simple |
| External Service Support | Required | Usually available through APIs |
| Failure Handling | Requires retry mechanisms | Can retry requests naturally |
| Best Use Case | Event-driven integrations | Systems without webhook support |
How Webhooks Work
- Your application creates a webhook endpoint.
- The endpoint URL is registered with the external service.
- An event occurs in the external system.
- The external service sends an HTTP request to your endpoint.
- Your application validates the request.
- The event is processed.
- Your system updates the relevant data or triggers another workflow.
This approach eliminates the need to repeatedly ask whether something has changed.
How Polling Works
- Your application determines how frequently it needs updates.
- The application sends a request to the external API.
- The API returns the current state.
- The application checks whether anything has changed.
- If there is a change, the application processes it.
- The process repeats at the configured interval.
Polling can be implemented quickly, but the polling frequency must be carefully selected.
Advantages of Webhooks
1. Near Real-Time Updates
Webhooks allow applications to react as soon as an event is generated, making them suitable for time-sensitive workflows.
2. Reduced API Traffic
Instead of repeatedly checking for changes, the receiving application gets notified when an event actually occurs.
3. Better Resource Efficiency
Reducing unnecessary API requests can lower network traffic and backend processing requirements.
4. Event-Driven Architecture
Webhooks naturally support event-driven workflows where one event can trigger multiple downstream actions.
Advantages of Polling
1. Simple Implementation
Polling is straightforward because the application only needs to make periodic API requests.
2. No Webhook Support Required
Polling works even when the external platform does not provide webhook functionality.
3. Greater Client Control
The application controls when requests are sent and how frequently data is checked.
4. Easier Recovery in Some Scenarios
If a request fails, the application can retry during the next polling cycle without depending on the external system to resend an event.
When Should You Use Webhooks?
Webhooks are generally a strong choice when the external platform supports event notifications and your application needs timely updates.
Common use cases include:
- Payment confirmations
- Order status updates
- Shipment notifications
- Customer registration events
- CRM updates
- Subscription changes
- Git repository events
- Communication platform notifications
- Workflow automation
When Should You Use Polling?
Polling can be useful when real-time updates are not essential or when the external system does not provide webhooks.
Common use cases include:
- Legacy APIs
- Scheduled synchronization
- Low-frequency data updates
- Third-party systems without webhook support
- Periodic reporting
- Background data synchronization
Long Polling vs Regular Polling
Regular polling sends requests at fixed intervals. Long polling uses a different approach where the server keeps the request open until new data becomes available or a timeout occurs.
| Regular Polling | Long Polling |
|---|---|
| Requests are sent at fixed intervals. | Server can hold the request until an update occurs. |
| Can generate many unnecessary requests. | Can reduce unnecessary repeated requests. |
| Easy to implement. | More complex server and connection management. |
| Suitable for periodic updates. | Useful when near-real-time updates are required without native webhooks. |
Webhooks vs Polling for eCommerce
Consider an online store that needs to synchronize payment and order information.
With polling, the store might repeatedly ask the payment provider whether the transaction has completed. During periods where nothing changes, many requests provide no useful information.
With webhooks, the payment provider can notify the store immediately when the transaction succeeds or fails.
For event-driven activities such as payment status, order fulfillment, and subscription updates, webhooks are often more efficient.
Webhooks vs Polling for SaaS Applications
SaaS applications frequently integrate with CRM platforms, payment systems, communication tools, analytics services, and other business applications.
Webhooks can help synchronize these systems when events occur. For example, a customer subscription update can trigger billing, notification, analytics, and account-management workflows.
Polling may still be useful for systems where event notifications are unavailable or where periodic synchronization is sufficient.
Security Best Practices for Webhooks
Webhook endpoints should be treated as security-sensitive APIs because they receive requests from external systems.
- Verify webhook signatures.
- Use HTTPS for all webhook endpoints.
- Validate request payloads.
- Implement authentication where supported.
- Prevent replay attacks using timestamps or event identifiers.
- Use idempotency to avoid duplicate processing.
- Log webhook events securely.
- Apply rate limiting where appropriate.
Webhook Reliability Best Practices
Webhook delivery can fail because of network problems, application downtime, timeouts, or temporary infrastructure issues. A production-ready webhook system should therefore include reliable failure-handling mechanisms.
- Implement retry strategies.
- Use exponential backoff.
- Store event identifiers.
- Make event processing idempotent.
- Use queues for asynchronous processing.
- Monitor failed deliveries.
- Maintain dead-letter handling where appropriate.
Can You Use Webhooks and Polling Together?
Yes. Many reliable integrations use a hybrid approach.
For example, webhooks can provide immediate notifications while periodic polling acts as a reconciliation mechanism. If a webhook is missed, the application can periodically compare its local state with the external system.
This approach can improve reliability for critical business processes such as payments, inventory, and financial transactions.
Common Mistakes to Avoid
- Using aggressive polling intervals.
- Failing to validate webhook requests.
- Processing duplicate webhook events.
- Not implementing retry mechanisms.
- Ignoring failed webhook deliveries.
- Performing heavy processing directly inside webhook requests.
- Failing to monitor integration health.
How Skillions Can Help
At Skillions, we help businesses build reliable API integrations, event-driven applications, and automated data synchronization solutions. Our development teams design integration architectures based on business requirements, data volume, reliability needs, and third-party platform capabilities.
Our Services
- Custom API Development
- Webhook Integration
- Third-Party API Integration
- Backend Development
- Event-Driven Application Development
- Microservices Development
- Cloud Application Development
- Automation & Workflow Development
- Payment Gateway Integration
- Enterprise Software Development
Conclusion
Webhooks and polling both have important roles in modern application integration. Webhooks are generally more efficient for event-driven, near-real-time updates because systems receive notifications when changes occur. Polling remains valuable when external platforms do not support webhooks or when periodic synchronization is sufficient.
The best approach depends on the capabilities of the external system, required response time, data volume, reliability requirements, and infrastructure architecture.
For critical applications, a combination of webhooks, queues, retries, monitoring, and periodic reconciliation can provide a robust integration strategy.
Skillions helps businesses design scalable API integrations and real-time software solutions that connect applications reliably and efficiently.
Frequently Asked Questions (FAQs)
What is the difference between webhooks and polling?
Webhooks allow an external system to send a notification when an event occurs, while polling requires an application to repeatedly request the latest information.
Are webhooks faster than polling?
Webhooks can provide near-real-time updates because notifications are triggered by events. Polling introduces a delay based on the configured polling interval.
Is polling bad for APIs?
Polling is not inherently bad, but excessive polling can create unnecessary API traffic and increase infrastructure usage. Polling intervals should be selected according to business requirements and API limits.
Are webhooks secure?
Webhooks can be secure when implemented correctly. HTTPS, signature verification, authentication, replay protection, validation, and idempotent processing are important security practices.
Can webhooks replace APIs?
No. Webhooks and APIs solve different problems. APIs are generally used to request or manipulate data, while webhooks are primarily used to notify applications about events.
Which is better for real-time applications?
Webhooks are often better for event-driven integrations where an external system can notify your application immediately. Other real-time requirements may call for technologies such as WebSockets or server-sent events.
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