plesk per plan separate account to login
this feature is well implement in blesta v3 which i have tested. not in whmcs.
i have customer which have few account, which they resell to their customer, but currently second account is provided with ftp account from whmcs email and if login with main accout, all account will be reveal by other customer.
it was pain to handle. need to manually do it in plesk panel.
hope any solution from whmcs.