Below are possible actions you can use to manage sub-accounts.

AddSubUserAdd a new sub-user.
AddTrialUserAdd a new trial sub-user.
UpdateSubUserUpdate existing account information for a sub-user.
DeleteSubUserDelete a specified sub-user.
GetUserInfoReturn account information about a specific sub-user.
GetSubUsersReturns a list of all active sub users and their account info.
GetASMReturns the average system metric information of selected user.
GetStorageSpaceReturns storage utilization for specific user.
GetBandwidthStatReturns encoding bandwidth for specific user.
GetBandwidthStatGroupDateReturn encoding bandwidth for specific user by date.