To purchase an Overflow subscription for your organization, click on the Buy link, either under the organization name while on trial, or under the Billing section. You can also buy directly from the website's Pricing page.
To add a new organization to your list of organizations, you need to purchase a subscription.
Once you purchase a subscription, you can access all billing details from the organization menu (top left).
You can see your pricing plan, billing cycle, the number of seats purchased, used and available, amount payable, invoice details, payment method, and invoice history.
You can add a discount code, change invoice details, change payment method, download previous invoices, and cancel your subscription.