Setting number of rows to generate in API URL

The number of records I need generated changes with every call of the API. I would have thought that this URL would have generated 15 records

https://my.api.mockaroo.com/mySchema.csv?key=1234asdfa&count=15 or

https://my.api.mockaroo.com/mySchema.csv?key=1234asdfa&generate=15