Atlassian has granted us community licenses for Confluence, Jira, Bitbucket and other products. How can I get licenses for apps?
You can login with your my.atlassian.com account and go into your Confluence or Jira instance. Use the universal plugin manager (UPM) to install new add-ons / apps. Then simply go ahead and buy the licenses. The price will be set to 0 USD. You can checkout and obtain the license key for your instance.