AccountPlan

Name	Type	Description
name	string	Name of the account plan
type	string	Type of plan this is (message, campaigns, support, etc)
shared	boolean	Whether this is a shared/includes-all type plan
assignable	boolean	Whether this plan is assignable in quantity to sub-accounts
quantity	number	Number of licenses available for this plan
size	number	The size of the plan (Message Bucket size)
effectiveStartDate	Date	Date the plan is effective
effectiveEndDate	Date	Date the plan expires
assignments	array	Sub-Account assignments of assignable plans