Get Activationstatus
https://URL:PORT/webapi/entry.cgi?api=SYNO.ActiveBackup.Activation&method=get&version=1
Set ActivationStatus (use your SERIALNUMBER)
https://URL:PORT/webapi/entry.cgi?api=SYNO.ActiveBackup.Activation&method=set&version=1&activated=true&serial_number="SERIALNUMBER"
for Office365 its the following urls
Get Activationstatus
https://URL:PORT/webapi/entry.cgi?api=SYNO.ActiveBackupOffice365&method=get_activation&version=1
Set ActivationStatus (use your SERIALNUMBER)
https://URL:PORT/webapi/entry.cgi?api=SYNO.ActiveBackupOffice365&method=set_activation&version=1&serial_number="SERIALNUMBER"
for GSuite its the following urls
Get Activationstatus
https://URL:PORT/webapi/entry.cgi?api=SYNO.ActiveBackupGSuite&method=get_activation&version=1
Set ActivationStatus (use your SERIALNUMBER)
https://URL:PORT/webapi/entry.cgi?api=SYNO.ActiveBackupGSuite&method=set_activation&version=1&serial_number="SERIALNUMBER"