Sync does exactly what it sounds like – it syncs the PIN (Personal Identification Number). Use Sync if you want to update your personal PIN stored in the device. Sync downloads the latest PIN from the LoopPay Systems. 

Fob Users - If you changed your PIN without your Fob attached, this changes the PIN on the LoopPay Servers.  Next time you attach your Fob, it remembers your old PIN. You will receive a message that your PIN has changed, and the two versions should automatically sync to the new PIN you chose.