Returns a JSON document of the following format:
{
id
: <number> - The ID of the received schedule.
sender_username
: <string> - The username of who sent the schedule.
text
: <string> - The text of the received schedule.
interval
: <number> - The number of days in which the received schedule repeats.
offset
: <number> - The number of days from January 1st 1970 the next day on which the received schedule is effective.
tags
: <string> - The space-separated list of tags.
insert_time
: <number> - The Unix timestamp of when the schedule was received.
}