mutation UpdateThreadServiceLevelAgreementPolicy($input: UpdateThreadServiceLevelAgreementPolicyInput!) {
  updateThreadServiceLevelAgreementPolicy(input: $input) {
    thread {
      id
      ref
      customer {
        id
        externalId
        fullName
        shortName
        email {
          __typename
        }
        avatarUrl
      }
      title
      description
      previewText
    }
    error {
      message
      type
      code
      fields {
        field
        message
        type
      }
    }
  }
}

{
  "input": {
    "threadId": "id"
  }
}

{
  "data": {
    "updateThreadServiceLevelAgreementPolicy": {
      "thread": {
        "id": "id",
        "ref": "string",
        "customer": {
          "id": "id",
          "externalId": "id",
          "fullName": "string",
          "shortName": "string",
          "email": {
            "__typename": "EmailAddress"
          },
          "avatarUrl": "string"
        },
        "title": "string",
        "description": "string",
        "previewText": "string"
      },
      "error": {
        "message": "string",
        "type": "VALIDATION",
        "code": "string",
        "fields": [
          {
            "field": "string",
            "message": "string",
            "type": "VALIDATION"
          }
        ]
      }
    }
  }
}