Hi Erik,
If your smart lock doesn’t have a keypad attached, you’ll need to create an app invite instead. This will create a 9 digit code which the user is able to redeem in the Nuki app to operate the smart lock.
You can achieve this by leaving the “type” as 0 in your smartlockAuth request and omitting the “code”.
Check out page 26 for the section “Invite a User” within the API documentation for further details: Nuki Web API
Kind regards,
Andrew