Automating web access to doo rlocl

Hi, I am planning to use Nuki door lock for an unmanaged small warehouse. I would like to integrate the nuki door lock API to an app (own developed for visitors) where someone can come over and request access to the door. Then I can automate, to check if the user is known and if so, then provide unlock access code or simply unlock automatically (without me being at the property).

I believe the hardware required will be: Door lock + Bridge +internet connectivity
But I am not sure what kind of API integration would help. Any help is welcome. If you have any similar discussion then that would be also helpful.