SubscriberOutputSelector ( token )
In the case of getSubscribers, you can specify an output selector of SubscriptionHistory or of SubscriberCount. If you specify an output selector of SubscriptionHistory, then you must include the user name of the user whose history you are retrieving.

Types that use SubscriberOutputSelector:

Enumeration Values
Value Description Which calls use this value *
SubscriberCount Use this value if you want to get a count of subscribers. getSubscribers
SubscriptionHistory Use this value if you want to get subscribers' history. If you specify a value of SubscriptionHistory, you must specify the user name(s) in the request. getSubscribers
  * See the Enumeration Index to see exact use of each enumeration value in the API.

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