It is possible, when an outdated version of the App is used, magazines can no longer be read. Make sure that the latest update of the App is installed on the device. In addition, it is important that there is a valid internet connection during the download.
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To offer in-app purchases product-id’s must be created. When your iTunesconnect account is active, can you offer in-app purchases. Because you have an own account all income from purchases in the app will be directly paid to you. Go trough the next steps when you are creating in-app purchases