Chrome Extension Kit

ARTICLE

What Is Polar.sh and Why Use It for Developer Products?

Product, checkout, and benefit flow for Polar.sh.

Polar.sh is billing infrastructure for developer products. It can handle hosted checkout, products, customer access, benefits, license keys, files, GitHub access, and webhook delivery.

For a paid Chrome extension, the payment itself is only one part of the system. After payment, the product must decide what the customer receives and how the extension verifies that right later.

Polar separates Product and Benefit. A Product is what you sell: a lifetime license, a monthly plan, a private template, or a course. A Benefit is what the buyer receives: a license key, GitHub repository access, file downloads, Discord access, credits, or a custom webhook flow.

That model fits developer products well. A Chrome extension can use license-key benefits for premium features. A starter kit can use GitHub repository access. A downloadable asset can use file benefits.

Chrome Extension Kit uses Polar.sh as the purchase and entitlement layer, then connects it to Cloudflare Worker APIs and extension-side license validation. The extension should never contain Polar management secrets. It should call your backend, and your backend should talk to Polar or your entitlement database.

Think of Polar.sh as more than a payment page. It is the system that connects a purchase to a concrete right your software can understand.

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