# The Freemius Checkout Integration Guide

This guide provides step-by-step instructions on how to seamlessly integrate the Freemius checkout into your application, ensuring a smooth and efficient payment process for your customers.

Learn how to add the checkout to your website, using the:

* [Overlay Checkout JavaScript API](https://freemius.com/help/help/documentation/checkout/integration/overlay-checkout/.md): To create a buy button that triggers the Freemius overlay checkout.
* [Freemius Hosted Checkout](https://freemius.com/help/help/documentation/checkout/integration/hosted-checkout/.md): Share a direct link to a secure, hosted checkout page with the ability to redirect customers after purchase.
* [Checkout API](https://freemius.com/help/help/documentation/checkout/integration/freemius-checkout-buy-button/.md): To customize the checkout experience and handle various events using callbacks.
* [Renewal & Updating links](https://freemius.com/help/help/documentation/checkout/integration/generate-renewal-payment-method-update-link/.md): To generate links for customers to renew subscriptions or update their payment methods.