A semi-colon -separated string containing 'polling-uri=' (required), 'polling-uri2=', 'polling-uri3=', 'polling-uri4=' and 'polling-uri5=' to indicate the URLs for notifications. May also contain a 'frequency=' value to specify how often (in minutes) the URLs will be polled; limited to 30, 60, 360, 720 or 1440 (default). May also contain the value 'cycle=' to control the notifications cycle.