This is Enlighten integration with SmartThings.
In order to use it you need the user_id visit: https://api.enphaseenergy.com/api/v2/systems?key=2bff33c35ee9c0b88c439cbe400e52c6
You will need to give permission for the App to access your account. Enlighten will also provide you with your user_id.
To get your system_id, visit: https://enlighten.enphaseenergy.com/systems/ and it will be redirected to something like: https://enlighten.enphaseenergy.com/systems/XXXXXX/
XXXXXX is your system_id