The only thing you need is to send the unlatch command to your lock.
The easiest solution is most likely to send an https call to the web api.
Just execute something like this:
curl -X POST --header ‘Accept: application/json’ --header ‘Authorization: Bearer YOURTOKEN’-d ‘{ \
“action”: 3, \
“option”: 0 \
}’ ‘https://api.nuki.io/smartlock/*SMARTLOCKID*/action’
This is how to get the token: Web API Authentication