# Customize line items in Checkout and Customer Accounts order summary using new Checkout Branding API settings  — Shopify developer changelog
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## Customize line items in Checkout and Customer Accounts order summary using new Checkout Branding API settings 

**As of Dec 4th, 2024**, you can use the settings under checkoutBrandingInput (see: merchandiseThumbnail) in the Checkout Branding API to modify the appearance of line items in Checkout and Customer Accounts order summary for Shopify Plus merchants. 

These line-item customizations include the ability to configure custom aspect ratios for product thumbnails, adjust image fit, and modify the background color of quantity badges. 

Note: The aspect ratio setting is only available on the current unstable release. 

Learn more under [checkoutBrandingInput](https://shopify.dev/docs/api/admin-graphql/2025-01/mutations/checkoutBrandingUpsert#argument-checkoutbrandinginput) in the Checkout Branding API documentation.

*Published: December 06, 2024*
Tags: API, Update
Link: https://shopify.dev/changelog/customize-line-items-in-checkout-and-customer-accounts-order-summary-using-new-checkout-branding-api-settings

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