If you have clients that you'd like to provide Natterly to, we offer a Reseller account that allows you to set up your own client accounts, and bill them externally.
If you're interested in becoming a Reseller, just get in touch with us.
Once you've been set up a reseller, you can start creating accounts. When you login to the Admin Console, you'll find a link on the left hand side within Settings - Resold Accounts.
Click Create New Account to get started:
Enter a name and subdomain for the account, then the email address, password and name for the initial administrator of the account. Once you've created the account, you can connect as any user, and your client can login and administer their account themselves if they wish.