Example for requesting service to service with Cloud Run to Cloud Endpoint

Currently, I'm working on using a cloud endpoint with my service, and I am able to deploy a service with espv2.

My question is, does anyone have an example for generating a token in a service that deploys in Cloud Run to request a Cloud endpoint?

This example will not work in cloud run since we cannot access private key to encrpt.
https://cloud.google.com/endpoints/docs/openapi/service-account-authentication

Start with the linked Cloud Endpoints service-account authentication guide and compare its private-key approach with the Cloud Run constraints described here. Document a concrete service-to-service authentication example that works from Cloud Run when calling a Cloud Endpoint, and explain how to verify the request.

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