Select the App Store & Play Market QR code type;
Insert the links to your application in App Store and Play Market;
Click Customize & Download QR;
Create your own code design and click Download QR Code.
Yes, a separate link will be shown for each. If the user scans the QR code through an Android device, they will be shown a link to the app on Play Market. If the user's device is running on an IOS platform - a link to the app in the App Store will be shown to them.
In the design settings you can choose a colour, a frame, add your unique logo.