echoWebhook

mutation {
  webhook {
    createSubscriptionWebhook(
      refreshToken: "myRefreshToken",
      label: "MyNameOfThatWebhook",
      subscription: "subscription Sub($txt: String!) { echo(text: $txt) }",
      variables: "{\"txt\": \"ABC\"}",
      webhookUrl: "https://myappwebhookurl.com"
    ) {
      ... on CreateSubscriptionWebhookViolationList {
        value {
          message
          path
        }
      }
    }
  }
}