last night a guest arrived and couldn't get in because the codes I sent were set to their original arrival day (today) rather than yesterday. After booking they decided to add an extra day on the front end, which I had changed in OR. But I forgot to update the keycodes to also start working one day earlier than their original booking.
I just sent up an alert email template using a trigger on booking dates changed to remind me to update the keycodes.
Figured I'd share in case anyone else is using manual custom fields for keycodes, it's kind of heartbreaking when people can't get in late at night (and you sleep through the phone ringing).
OwnerRez supports door lock code integration for certain types of door locks:
https://www.ownerrez.com/support/articles/integration-door-locks
If you're using this, the code would have been taken care of automatically.