This Python application provides a microservice that enables applications to request a video chat session using the Vonage Video API, allowing users to obtain a session ID and token to interact with OpenTok. The application uses Flask and Serverless to deploy to AWS Lambda, where it can be accessed via an API Gateway URL. To use the application, users must set up their environment by cloning the repository, renaming `.env.default` to `.env`, and adding their Vonage Video API credentials. Once set up, users can run the app locally or deploy it to AWS Lambda using Serverless. The application provides four URL endpoints for testing and interacting with OpenTok: a GET endpoint that returns a generic message, a POST endpoint that creates a session ID, a token endpoint that returns a token needed to interact with OpenTok, and another token endpoint that takes a session ID as input. Users must secure the app if they intend to leave it active, as anyone with access to the URL provided after deployment can access it without authentication or verification.