> For the complete documentation index, see [llms.txt](https://support.referralhero.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.referralhero.com/integrate/rest-api/webhooks.md).

# Webhooks

Interacting with a third-party API like ReferralHero's can introduce two problems:

* Services not directly responsible for making an API request may still need to know the response of that request
* Some events, like deleting a subscriber, are not the result of a direct API request

Webhooks solve these problems by letting you register a URL that we will notify anytime an event happens in your campaign. When the event occurs—for example, when a user successfully subscribes to your list, ReferralHero will send a webhook notification to your registered webhooks. 

Understand that you only need to use webhooks for behind-the-scenes events. \
The results of most ReferralHero requests—including new subscriptions—are reported synchronously to your code, and don't require webhooks for verification. 

### Important Considerations

Due to the nature of network requests, your application should assume webhook requests could arrive out of order or could even fail to arrive; webhooks should be used only as notifications and not as a primary ReferralHero data source (make sure your application could still work when webhook is not available).