Zend certified PHP/Magento developer

How to access third party extension sales_order column via Order API in Magento 2?

We’re using Novuna PaybyFinance (formerly Hitachi PaybyFinance) version 1.7.1 in Magento 2.4.3-p3 and need to be able to access Novuna’s column 'finance_application_no' which is present in the sales_order column via the Order API.

Can anyone guide me on how to do this?

Thanks