Create Subscription
Reference Id	MAX = 20 chars
Subscription Name
Subscription Length	1 - 12 or 7 - 365
Subscription Unit	months or days
Start Date	YYYY-MM-DD
Total Occurrences	MAX = 9999
Trial Occurrences	0 = None. MAX = 99
Amount
Trial Amount	0 = None
Credit Card Number
Expiration Date	YYYY-MM
First Name
Last Name

Update Subscription
Subscription Id
Credit Card Number
Expiration Date
First Name
Last Name

Cancel Subscription
Subscription Id