Homey app for retrieving your zonneplan inverter data
Go to the settings of this zonneplan app and provide your email, submit, allow this zonneplan session by clicking the link in your email client and go back to the app and finish your registration. Add your device, it will show you all the zonneplan contracts which have PV or P1 as type.
Device will poll every 2 minutes the latest data, but data will be refreshed every 5 minutes on zonneplan.
Troubleshooting, if the token is expired, you can fix it by doing the app settings again and it will pickup latest access token.