Certain business models are simply off the table in the App Store — using the app as a storefront for a physical product catalog, charity apps that take a cut, apps that are really just ads. Here's what's acceptable and what's not.
What Apple said
“Your app's primary purpose appears to be to advertise an external product or service rather than to provide standalone value to users. Apps that function primarily as marketing materials for external businesses or products are not appropriate for the App Store.”
Apple wants apps that provide genuine utility or content value to users, not apps that are essentially digital ads. An app that does nothing except show your product catalog and links to your website, or an app whose main function is driving users to an external purchase they make off-platform, will get rejected. The app itself has to have real value.
While you're at it — Apple also requires these pages for every app.
Fix this rejection, then make sure you're covered on the compliance side too. Apple requires every app to link to a hosted Privacy Policy, Terms of Service, Support page, and Data Deletion page. No link means another rejection — just for a different reason.