My app has been approved before with iHasApp. A new update has been rejected by Apple with the following reason: "Applications may only use Documented APIs in the manner prescribed by Apple and must not use or call any private APIs" We found that this app scan all known URL schemes using a service called iHasApp. How to fix that?
Apple recently began rejecting apps that use canOpenURL: simply to determine which apps are installed on a user's device. You'll have to remove the library in question.