You can easily delete sub accounts from your master account by sending the following XML to the API:
<?xml version="1.0"?> <query> <userid>[UserID]</userid> <userkey>[UserKey]</userkey> <action>DeleteSubUser</action> <action_user_id>[ActionUserID]</action_user_id> </query>
You'll receive the following response:
<?xml version="1.0"?> <response> <action>deletesubuser</action> <status>Success</status> </response>