# Overview
Using a Drop-in script can help you to handle more advanced use cases like,
- Setting checkout and portal callbacks.
- Modifying the plan quantity dynamically.
- Adding/removing addons on demand.
- Prefilling customer information and shipping information in the checkout.
You can easily create a checkout page by adding a script generated for the plan-item
on your HTML page.
Learn more about the customizations and capabilities.
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