[{'role': 'user', 'content': "Analyze the following clause from a privacy policy and determine if it's fair or unfair. Also identify any privacy practices mentioned: http://www.apple.com/legal/internet-services/gamecenter/ http://www.apple.com/legal/privacy/ https://play.google.com/intl/en_in/about/play-terms.html https://www.google.com/policies/privacy/ https://www.amazon.com/gp/help/customer/display.html?nodeId=201487670 https://www.amazon.com/gp/help/customer/display.html?nodeId=468496 https://www.facebook.com/terms https://www.facebook.com/privacy/explanation In-App purchases: Our Apps enable in-app purchases. In order to make a purchase from us, you must use our third party checkout options to finalize and pay for your order. In-app purchases may be made only upon entering the app store password and you are responsible for maintaining the security of such password. Your authentication and security maintaining is subject to specific terms of the app store and the OS of your mobile device. You should be aware of the iOS' 15-minute and Android's 30-minute window after the downloading of an Application, during which in-app purchases may be made without inserting an in-app store password. You should also take into account that OS 2.1 or older versions of Android mobile phones do not require entering of the app store account password to carry out in-app purchases."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]