Background Check Results and Status URL

Hello,

We provide background check details to our clients by exposing a POST REST endpoint.
In the payload we expect XML with credentials (client name, password, and some candidate ID).

How can iCIMS platform users access this endpoint?

When we do patches to update the background check status, we can send a link:
Order Status: In-Progress Vendor
Result URL: {BACKGROUND CHECK STATUS LINK HERE}
according to: https://developer.icims.com/Standard-Integrations/Partner-Screening

But this doesn't send us a POST request.
How can the iCIMS platform send credentials and candidate ID in a POST or GET request?

Thank you.