also if you use the interval ONCE, then notifications obviously will be triggered only once... depending on what you need, there are several intervals to choose from...
For the Start method
Interval can be one of the following values: 'ONCE', 'WEEK', 'MONTH', 'YEAR'.
For the StartRepeating method
Interval can be one of the following values: 'FIFTEEN_MINUTES', 'HALF_HOUR', 'HOUR', 'HALF_DAY', 'DAY'
protip: read the documentation
Taifun