QR code guides

• Why did my QR code stop working?The most common reason is an ended free trial. How to check which kind of code you have and what to do next.
• Static vs dynamic QR codesWhich kind expires, which kind you can edit, and which one you actually need.
• How to replace a QR code you already printedStickers, reprints and other ways to fix menus, flyers and packaging with a dead code.