Use UUIDs in the Spend & Expense API

In February 2025, BILL introduced UUIDs in the Spend & Expense API for further improving its security standards. All API responses include both id and uuid values.

As of July 9, 2025, the Spend & Expense id values are being deprecated. Both id and uuid values will continue to be available in all API responses. We strongly recommend that you use uuid instead of id in all your Spend & Expense API operations.