Apple Pay is powerful but comes with strict implementation requirements. Missing disclosure language, using it for prohibited transaction types, or not following the UI guidelines will get you rejected under 4.5.6.
What Apple said
“Your app's Apple Pay implementation does not comply with the Apple Pay guidelines. We noticed that the payment sheet does not include required merchant information and the purchase confirmation page is missing required disclosure language. Please review the Apple Pay guidelines and update your implementation.”
Apple Pay transactions must meet specific disclosure and UI requirements — the merchant name must be clear, total amounts must be displayed, and certain prohibited uses (like for recurring payments without IAP) aren't allowed. Apple audits Apple Pay implementations carefully because they put their brand directly on the checkout flow.
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.