api - Is there a way to create a Shopify storefront app that only affects one page of the store?
You are looking for Shopify App Proxy (https://shopify.dev/apps/online-store/app-proxies). It perfectly fits your use case as
App proxies take requests to Shopify links, and redirect them to external links. This allows you to fetch and display data on a merchant's store from an external source.
Just create an app proxy. Handle the initial request to render form for user input. On form submission, receive the data on your proxy backend and do any API calls that you need.
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