Lists the effective hierarchy of expense categories. At least one of employment_id, expense_id, or country_code must be provided.

Authentication

This endpoint accepts any one of the following token types:

• Company-scoped access token (OAuth2AuthorizationCode) — obtained through the Authorization Code flow or the Refresh Token flow. See Authentication for partners.
• Customer API token (CustomerAPIToken) — generated by the customer on their Integration Settings page. See Authorization for customers.