You will need a JetBrains Account to purchase Space On-Premises, as well as to manage your subscription after the purchase. If you do not already have a JetBrains Account, you will be guided through the account creation process when you purchase Space.
Your JetBrains Account is your single interaction point for your JetBrains products and services. It provides easy and safe access to your subscriptions and seamless upgrades. It is a simple and convenient way to access and manage your purchases, view your order history, change the parameters of your subscriptions, and more.
Members of your Space organization are not required to have JetBrains Accounts.
You can find more information about the JetBrains Account (JBA) in this dedicated FAQ.