3815142 - How do I retrieve the expense entry key (rpe_key) using SAP Concur APIs?

I am integrating with the SAP Concur Expense APIs and need to retrieve the expense entry key for an expense entry. I checked the available endpoints, but I cannot find this field in any of the current API responses. I need clarification on where to locate the expense entry key and whether it still exists in the latest SAP Concur APIs.

Information about the availability of the Entry Key in SAP Concur APIs. Clarifies that this field was part of a deprecated API and is no longer returned in any expense endpoints. , KBA , CON-INT , Integrations , Problem