How to customized the storefront hosted on Shopify with Storefront API?

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I want to customize the store front hosted on Shopify, not my own website, by using StoreFront API.

In my dev store, I only find the theme customization. Is there a way to do that? What I need is to check a Metafield value  during the checkout.


I have already searched on the Shopify app store and can not find one. Please do not recommend me to do that.


Thank you,