Web Service Application onboarding with response sent asynchronously

Hi All,
Looking for suggestions to onboard a Rest XML based application which sends response asynchronously

https://magnitglobal.com/us/en/solutions/vendor-management-system/wand-api.html#extract-worker-data

For generic Web services connector, I believe request response has to be synchronous. Kindly suggest possible approach to integration asynchronous web services.

Thanks in advance