> ## Documentation Index
> Fetch the complete documentation index at: https://supertab-feature-merchant-auth-change-again.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Validate Purchases with Server-Side Webhooks

> Merchants can now securely confirm completed purchases and trigger powerful post-purchase workflows—like granting access, sending emails, or updating analytics—in real time.

### What’s new

We’ve introduced two key features to help merchants validate purchases securely:

1. Webhooks that notify your server when a purchase is complete
2. Enhanced client-side callbacks that include detailed purchase data

### Why it matters

For high-value services—like generative AI or premium content—client-side validation isn’t enough. This release enables secure, server-side confirmation of purchases before access is granted, reducing fraud and protecting merchant resources.

### What you can do with it

Server-side webhooks unlock a wide range of automation and security options:

* **Secure Access Control** — Grant access to content or services only after a verified purchase.
* **Personalized Onboarding** — Kick off welcome emails, setup flows, or user provisioning.
* **Real-Time Analytics** — Sync purchase data with internal dashboards or CRMs.
* **Customer Support Workflows** — Create support tickets or alerts when purchases happen.
* **Loyalty & Rewards** — Automatically assign points or trigger reward logic based on purchases.

### How it works

<img src="https://mintcdn.com/supertab-feature-merchant-auth-change-again/B786G4ztkFXXa9gr/images/Webhooks.png?fit=max&auto=format&n=B786G4ztkFXXa9gr&q=85&s=f20ecdc034f9543c77897ab156fe2097" alt="Webhooks Section in the Supertab Business Portal" width="1621" height="1024" data-path="images/Webhooks.png" />

* Enable webhooks from the new **Webhooks** tab in the Business Portal. We use Svix to deliver events like purchase.added, including key purchase metadata.
* Use the updated `onPurchaseComplete` callback in Tab.js to access purchase ID, user ID, and other validation data.
* Webhooks also work in [**Test Mode**](https://docs.supertab.co/supertab-experiences/test-mode), so you can safely build and test your integration.

This gives you end-to-end purchase security and the flexibility to build powerful merchant-side workflows. Want to see it in action? [Reach out for a demo or setup support](mailto:sales@supertab.co).