curl --request GET \
  --url https://production.runalloy.com/connectors/{connectorId}/credentials/metadata \
  --header 'Authorization: Bearer <token>' \
  --header 'x-api-version: <x-api-version>'

{
  "metadata": [
    {
      "authenticationType": "oauth2",
      "inputSchema": {
        "type": "object",
        "properties": {
          "userId": {
            "type": "string"
          },
          "redirectUri": {
            "type": "string"
          },
          "data": {
            "type": "object",
            "properties": {
              "subdomain": {
                "type": "string"
              }
            },
            "required": [
              "subdomain"
            ]
          }
        },
        "required": [
          "userId",
          "redirectUri"
        ]
      }
    }
  ]
}