I would be able to retrieve connector setup metadata, prior to setting up the connector in order to see all the fields (required and optional) so I can setup each connector in code. I have noticed a pattern that almost all connectors have the same set of required parameters, but there are some exceptions. These exceptions are e.g. Google Analytics, Twitter, AdRoll and probably some more, which require more than the schema property of the configuration. 

If I would have an endpoint, e.g. https://api.fivetran.com/{version}/metadata/connectors/{connector_type} which would return an object similar to this:

Result from https://api.fiveran.com/v1/metadata/connectors/github

{
  "service": "github",
  "config": {
    "schema": {
      "required": true,
      "description": "..."
      "possible_values": []
    }
    "table": {
       "required": false,
       "description": "...",
       "possible_values": []
    },
    ...
  }
}

This would help tremendously to encapsulate the Fivetran setup completely from the users using our software.