Your Attribution Partner may ask for Organization UUID when you set up the integration.
In order to find it in SearchAdsHQ account:
Log into your SearchAdsHQ account.
Navigate to Integrations on the left-hand menu. Place the mouse pointer on one of the Attribution Partner logos until you see View Settings button.
Click on VIEW SETTINGS. Your Client ID here is the same as your Organization UUID for Attribution Partners.
You can copy it right from this pop-up window.