GitHub Marketplace contains tools and services that complement and improve your workflow.
If you purchase a paid app, you'll pay for your app subscription with the same billing information you use to pay for your GitHub subscription, and receive one bill on your regular billing date. For more information, see "About billing for GitHub Marketplace."
Building and listing an app on GitHub Marketplace
For more information on creating your own GitHub App or OAuth App to list on GitHub Marketplace, see "Apps" in the GitHub Developer documentation.