---
title: "Automatically apply discount codes in overlay checkout"
slug: "automatically-apply-discount-codes-in-overlay-checkout"
tags: ["Setup"]
updated: 2026-06-16T15:34:38Z
published: 2026-06-16T15:34:38Z
canonical: "mysupport.roller.software/automatically-apply-discount-codes-in-overlay-checkout"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://mysupport.roller.software/llms.txt
> Use this file to discover all available pages before exploring further.

# Automatically apply discount codes in overlay checkout

> [!NOTE]
> This is entirely controlled via script injection, and dev involvement is required. This is consistent with how all other overlay parameters currently work.

You can now automatically apply a discount code when launching an overlay checkout from your website. This means if a guest taps a promotional button or CTA, the discount is already applied — no need to type anything in.

Whether you want to boost bookings with a “Buy More, Save More” offer or reward specific promotions, you can now pass a code like **SUMMER25** directly through the overlay experience.

This helps increase conversion rates, reduces drop-off and ensures that your guests don’t miss out on deals you’re offering. To use it, your developer just needs to include the code when triggering the overlay checkout.

## Create a discount code

You'll need to create or choose a discount code to add to the overlay. Check out [Discount codes in ROLLER](/v1/docs/get-started-with-discount-codes) to see discount code options and learn how to create one.

## Add a discount code to overlay checkout

Your dev team must modify the script tag used to load the overlay checkout. They inject the discount code using the `RollerCheckout.show()` method with the `discountCode` parameter.

Example: `onClick="RollerCheckout.show({ productId: '15292', date: '2025-08-20', discountCode: 'SUMMER25' })"`

> [!WARNING]
> This is an **optional parameter** and does not change the way the overlay script is added to the site. It simply provides an enhancement for applying discount codes dynamically at launch.

## Related

- [Add the full-page checkout experience to your website and social pages](/add-the-full-page-checkout-experience-to-your-website-and-social-pages.md)
- [Track guest behavior and conversions in progressive checkouts](/track-guest-behavior-and-conversions-in-progressive-checkouts.md)
- [Share a discount with a checkout link](/share-a-discount-with-a-checkout-link.md)
- [What's new in ROLLER: July 2025](/what-s-new-in-roller-july-2025.md)
- [Add the overlay checkout experience to your website](/add-the-overlay-checkout-experience-to-your-website.md)