To retrieve a preview URL for a specific WhatsApp Flow using Meta's Flows API, you can make an HTTP GET request
to the designated endpoint. This allows you to visualize and interact with the flow before deploying it to end users,
facilitating testing and validation of the flow's functionality and user experience.

For detailed instructions on generating a web preview URL, refer to Meta's official documentation:
https://developers.facebook.com/docs/whatsapp/flows/reference/flowsapi