mutation UpdateAccountTier($input: UpdateAccountTierInput!) {
  updateAccountTier(input: $input) {
    accountTierMembership {
      id
      tierId
      accountId
      createdAt {
        unixTimestamp
        iso8601
      }
      createdBy {
        __typename
        ... on UserActor {
          __typename
        }
      }
      updatedAt {
        unixTimestamp
        iso8601
      }
    }
    error {
      message
      type
      code
      fields {
        field
        message
        type
      }
    }
  }
}

{
  "input": {
    "accountIdentifier": {}
  }
}

{
  "data": {
    "updateAccountTier": {
      "accountTierMembership": {
        "id": "id",
        "tierId": "id",
        "accountId": "id",
        "createdAt": {
          "unixTimestamp": "string",
          "iso8601": "string"
        },
        "createdBy": {
          "__typename": "UserActor"
        },
        "updatedAt": {
          "unixTimestamp": "string",
          "iso8601": "string"
        }
      },
      "error": {
        "message": "string",
        "type": "VALIDATION",
        "code": "string",
        "fields": [
          {
            "field": "string",
            "message": "string",
            "type": "VALIDATION"
          }
        ]
      }
    }
  }
}