Each time that you want to connect an external 3rd party app, or your own App you can or you should generate a new Token just to that App. In order to do that you must first activate the NIZU CLOUD developers App.
Settings
Apps
NizuCloud
Install
Activate
Once activated follow this steps:
Settings
Apps
Developers
Tokens TAB
Click on the Button ADD
NZU will instantly provide you with a unique Key. It's important to copy and paste it in a safe place