Example of how to use Vercel's deployment APIs to determine whether the loaded next.js application is running the latest code on production.
Set VERCEL_TOKEN to a Vercel API Access Token scoped to your project.
Update the teamId, projectId, and productionBranchUrl constants in pages/api/index.tsx to match your team and project's information.
The UI for this application simply renders the results of the API call, and the currently loaded version (exposed as an environment variable in next.config.js). You can extend this to poll the version API and display a message to the user if they are not running the latest version.