API Key
Organization ID
Challenge ID
Name
Start Date (2016-08-01T12:00:00-08:00)
End Date (2016-08-01T12:00:00-08:00, optional)
Recurring (0=one time, 3=monthly)
Device types (comma-separated list)
Exclude device types (comma-separated list)
Participant type (0=group, 1=individual)
Participant status
Participant tag
Exclude participant tag