Webhook test

I am using the following GraphQl code with the correct substitutions:

mutation {
    createWebhook(input:
    {
        actions: [
            "card.field_update"
        ],
        name: "<Some Name to Remember What This WebHook Does>",
        url: "<The URL you got From Zapier>",
        pipe_id: "<The ID of the Pipe you want the WebHook to be associated with>"
    }) {
        clientMutationId 
    }
}

However, when I run the following code in:

https://app.pify.com/graphiql

I receive the following error message:

{
  "data": {
    "createWebhook": null
  },
  "errors": [
    {
      "message": "Permission denied",
      "locations": [
        {
          "line": 4,
          "column": 3
        }
      ],
      "path": [
        "createWebhook"
      ],
      "code": 30001,
      "type": "PermissionDeniedError"
    }
  ]
}