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Making sure that any content in your app that could be seen by children is appropriate for them.
Only displaying ads that are appropriate for children, whenever your app is being used by a child.
Only displaying ads that are from Google Play certified ad networks , or ads served by you, whenever your app is being used by a child. This includes ads for your own apps, or from partnerships with other brands.
Making sure that your app (including all APIs, SDKs and ads) complies with all applicable laws and regulations relating to children, such as the US Children's Online Privacy Protection Act COPPA, and the EU General Data Protection Regulation GDPR