curl --request GET \
  --url https://api.nango.dev/connection/{connectionId} \
  --header 'Authorization: Bearer <token>'

{
  "id": 123,
  "connection_id": "<string>",
  "provider_config_key": "<string>",
  "provider": "<string>",
  "errors": [
    {
      "type": "auth",
      "log_id": "VrnbtykXJFckCm3HP93t"
    }
  ],
  "metadata": {},
  "connection_config": {},
  "tags": {},
  "created_at": "<string>",
  "updated_at": "<string>",
  "last_fetched_at": "<string>",
  "credentials": {
    "oauth_token": "<string>",
    "oauth_token_secret": "<string>",
    "type": "OAUTH1",
    "raw": {}
  },
  "end_user": {
    "id": "<string>",
    "email": "<string>",
    "display_name": "<string>",
    "tags": {},
    "organization": {
      "id": "<string>",
      "display_name": "<string>"
    }
  }
}