The Commissioning Session is created in WiZ Pro Dashboard.
Select a Site, go to the Settings, Commissioning Session, and select "Create a commissioning session".
You will need to enter the SSID of the WiFi network of the site as well as the password. These elements will allow the installer's phone to commission the devices without having access to the network credentials. Those will be pre-filled in WiZ Pro Setup app.
You also have the option not to include any credentials and let the installer decide in the Setup app for keeping the new products on Bluetooth, or entering Wi-Fi credentials.
Then, select "Save" to initiate the session.
The Invitation code is the one to be given to Installers so that they can JOIN the Site ( by selecting the Join option in WiZ Pro Setup).
You can stop the commissioning session any time which will revoke the access rights for the installer in WiZ Pro Setup app.