Wireless numeric keyboard for amazon courier or guests? Is there any already

made, in WiFi/Zigbee /Zwave?

My electric gate is already controllable via HASS, would be useful to have an external numeric keypad that once you enter a secret code will unlock the door.
I find it particularly useful for Amazon courier (you can give the code to Amazon at check out). Of course the secret code will have to expire but that’s a software issue that can be programmed.

Now I am looking for the hardware first. Any ideas?
Ready made preferred. As alternative a mild DIY solution.

The keypad need to be on the exterior

I bought this item below, now need to find a way to make it wireless