Every purchase, subscription and top-up is recorded in one place, so you can pull any document later for your records.
Your transaction history
Open Plan & payments in your account and go to your Transaction history - a single feed of your activity you can filter by All, Purchases, Subscriptions, Top-ups and Refunds.
Documents you can download
From the feed you can View invoice, View receipt, and download the license document for a purchase. Your active licenses are also listed in the Licences tab.
Subscription: one certificate per project
A subscription covers every project you register while it is active. Open the Licences tab, choose View scope on a track, and register the project you are using it in: each project gets its own license certificate, with the date you registered it. A registered project stays licensed forever, even after you cancel. Once your subscription has ended you can still download those certificates, but you cannot register a new project.