PostMan PIN + Tracking Number LCD

Im dealing in my head some project to show postman a PIN code to confirm the package delivered.

So for this kind of project I have some guides need to follow:

  1. Must be the most low powered possible (remote location)
  2. Must show to post guy 2 Lines (Tracking number + pin) (RD123456789PT + PIN)
  3. Can have more lines for more codes…
  4. This codes I have a way to send them remotely from HA or from iPhone
  5. The best option is remove the codes remotely.
  6. To save power maybe some switch on door or pressing…

Any idea?

I do not try nothing… maybe need some advice on parts or code…

discuss the crazy ideia…