To avoid rejections by Apple, we recommend following the instructions in the articles contained within the "Creating Your mag+ Apps" section. There are several articles that provide information on what to do prior to building your app based on the type of app you will create.
If, however, you receive an Apple rejection due to "Server Unavailable," this article will walk you through resolving the issue.
This rejection is typically due to a misconfiguration between in-app purchases in iTunes Connect and settings in the mag+ Publish portal. Please review the following scenarios: