I have an application. I want to generate a page for the customer’s store through the API interface, and generate a link address on the store to open it.
For example, the link above
The app proxy is just a route for web requests to hit your own resource. As for your own resource, that's where you could look into using the Shopify Page API endpoint. If you see methods documented in there that will achieve what you're looking for then this should be worth testing out some.