Siebel Inbound REst API with Large Dataset

Hi

I am using a Siebel Inbound REST API based on a Business Object that is a copy of the standard Employee BO.
My goal is to return all employee details to an external application.

When I test the API in Postman, I only receive a subset of the data instead of the full list of employees. The API call includes pagination parameters such as StartRowNum and PageSize. If I change StartRowNum (for example, to 100), I receive a different subset of records.

We are using an Azure API as middleware. Where should I implement the logic to retrieve all employee records?