How to use REST Connector?

How to use REST Connector?

I'm trying to use the REST Connector, and I'm having some trouble. There are no examples in the Gallery and it's the only connector that doesn't have a page in the docs: https://docs.skyvia.com/connectors/

I have a URL that I would like to POST data to, and I want to set that URL up as a Connection using the REST Connector

There's a URL field that's straightforward, but there's a required Metadata field on the Connection. What is that for? What do I need to put in there?

Are there examples anywhere of a scenario like this?