NFC (Near Field Communication) is a small chip in the back of the tray. The first tap opens this page. You can point it at any link you want.
Android: Settings → Connected devices → NFC. iPhone: NFC is already on. Hold the top edge of the phone to the pill icon on the back.
On Google Play or the App Store, install NFC Tools by wakdev. Look for the orange square with a white phone and the letter N.
The chip ships unlocked. We do not collect or write your links for you.
NFC is a $3 add-on. Trays without it have no chip and no pill icon.