So, after you published your app, a confirmation screen will appear. This is where you can find your QR code. You can also find your QR code when you click on the link here, and this will showcase your app. Bottom right will clearly show your QR code.
You can print them out on stickers, business cards, brochures, anything you like. When your customers uses the QR code, it will automatically bring them to your mobile app. This is one great way to getting your mobile app advertised and promoted through printed materials. So, let's say you own a cafe or a restaurant; you could put your QR code on the menu or even a sticker on the table, where your customers can access easily.