Premier accounts can add an unlimited number of projects. Standard accounts are limited to one project.
You can upgrade an individual account from the payment page. It costs $6 per month and we accept Paypal and Bitcoin.
There is a yearly option which includes a 10% discount (Paypal only).
Subscriptions can be cancelled at any time from your Paypal account or Coinbase account.
You can view invoices/ receipts from your account area.
If your subscription expires you will only be able to access one account. If you subsequently re-upgrade you will have full access to your accounts again.
For enterprises with multiple users you can verify your domain from the "Manage your domain" section in your account area.
Once verified you can create users and upgrade them to paid accounts.
You can either purchase a set number of licences under one subscription or you can upgrade users each with an individual subscription.
Note that in order to change the number of licenses at a later date you will first need to cancel the exisitng subscription before taking out a new one.