Shopify Checkout Extensions Explained

Checkout extensions are Shopify's modern way to customise the checkout without editing checkout.liquid. They are the recommended path now that checkout.liquid is being deprecated for most merchants.

What they let you do

• Add banners, custom fields and messaging at specific checkout steps.
• Offer upsells and cross-sells inside checkout.
• Apply custom validation and delivery logic.
• Brand the checkout to match your store (on Shopify Plus).

Why extensions, not checkout.liquid

Extensions run safely inside Shopify's environment, so they stay fast, secure and upgrade-safe. Editing checkout.liquid directly is being phased out because it is fragile and hard to maintain. Building on extensions means your checkout keeps working through Shopify's updates.

The impact

Checkout is the highest-intent moment on your store. Thoughtful extensions reduce friction and capture extra order value exactly when customers are ready to buy.

Experts Cabin develops checkout extensions for Shopify Plus brands that want a branded, higher-converting checkout.