As I use only codes for keypads, I would prefer a simple code cration for bookings. In my experience, guests won´t install the nukiapp. Further, on smoobu platform, I can make my own mailtemplate to send the code to guests.
Hello, we already offer this through the Nuki Smart Hosting service. It is possible to create keypad codes only if the keypad is connected to the Smart Lock (or Opener).