If you have an App in an App-Store you can promote your App with a QR Code. If a user scans the QR Code, he will be redirected to the App-Store where he can install your App directly on his Smartphone. But what if you have deployed your App to different stores (e.g. Google Play, Windows Phone Store, Amazon Store or the iOS App Store)? Do you need a QR Code for each store?
The answer is: No! You can use a single App-Store QR Code instead of creating a QR Code for each store.
Multi-URL encoded in a QR Code
An App-Store QR Code has a Multi-URL encoded. A Multi-URL contains multiple URLs. Depending on the device the user is being redirected to one of the URLs. When using a Multi-URL in a QR Code you can set a redirect for iPhone, Android or Windows Phones. If the QR Code is scanned by another device, you can also setup a fallback URL, to which the user is being redirected.
Country based App-Store Redirects
If you deploy an App the App-Store might restricts the App to specific countries or the App-Store is blocked in one country. For example, there is no Google Play Store in China  yet. To overcome this problem, you can set an optional App-Store link for each country. So if a user scans your QR Code with an Android device in China, he will be redirect to a different App-Store than to the Google Play Store.
Try it out yourself by creating an App-Store QR Code below: