SAMBA+ is available as software subscription and can be procured at the SAMBA+ shop for a period of one year - and optional also for two or three years with some discount.
Visit the shop here: shop.samba.plus
The terms & conditions for SAMBA+ are part of the subscription contract and acknowledged by the customer upon checkout.
SAMBA+ subscriptions bought at shop.samba.plus are managed with OPOSSO at https://oposso.samba.plus. Subscribers activate their subscriptions and manage access credentials. The platform also sends reminder mails before subscription ends.
OPOSSO itself is an open source software and has been released on GitHub to the public under GPL. More information are available on oposso.org.