mutation ConfigureGitLabProjectWebhook($projectId: ID!) {
  configureGitLabProjectWebhook(projectId: $projectId) {
    project {
      id
      name
      pathWithNamespace
      webUrl
      defaultBranch
      visibility
    }
    callbackUrl
    signingToken
    manualConfigurationRequired
  }
}

{
  "projectId": "id"
}

{
  "data": {
    "configureGitLabProjectWebhook": {
      "project": {
        "id": "id",
        "name": "string",
        "pathWithNamespace": "string",
        "webUrl": "string",
        "defaultBranch": "string",
        "visibility": "string"
      },
      "callbackUrl": "string",
      "signingToken": "string",
      "manualConfigurationRequired": true
    }
  }
}