Search API 2.0 ‘heldinState’ parameter change

On 12 February 2021 we are installing a new version of WorldCat Search API 2.0 so the ‘heldinState’ parameter aligns with ISO standards and better supports global holdings. After the install, the ‘heldinState’ parameter will require the ISO 3166-2 code for country subdivision instead of a 2-character state/province code. This change will break existing code, so we recommend you update your code to use ISO 3166-2.

If you have any questions about this change, please contact OCLC customer support.