@Marvin can you point me to prefect v1 documentation regarding registering flows, specifically what URLs/endpoints are used?

Unfortunately, I'm afraid the URL/endpoint for registering flows in Prefect version 1 is not available as the Prefect API server is running in Prefect version 2. You can find more information about Prefect version 2 in the [Prefect 2 documentation](https://docs.prefect.io/tutorials/orchestration/). You can also find release notes, blog posts, and community support at [the Prefect Github page](https://github.com/PrefectHQ/prefect/blob/main/RELEASE-NOTES.md). Additionally, you can find a Prefect Cloud Quickstart guide on [Prefect Cloud](https://docs.prefect.io/ui/cloud-quickstart/), as well as more information about Flow deployments at [Flow deployments](https://docs.prefect.io/tutorials/deployments/). I hope this helps in some way!