What can I actually customize in checkout?

Checkout is more restricted than the rest of your storefront because Shopify protects payment and order flow.

What you can usually customize

• Brand styling (logo, colours) via Shopify settings
• Some checkout UI (plan-dependent)
• Apps that add approved checkout extensions (plan-dependent)

What you typically can't do

• Fully custom checkout layouts using theme code
• Arbitrary scripts or DOM hacks that interfere with payment flow

Best practice

Treat checkout as: "optimize the inputs you control"

• Make product pages clear
• Make cart frictionless
• Keep shipping/returns messaging obvious
• Use apps/extensions that follow Shopify's supported approach