Qualys BYOL Deployment Process

Hi, Does anyone know how MDC installs the Qualys scanner/extension on the VM after clicking <Proceed> on "Deploy your configured third-party vulnerability scanner"?  Aspects like, where the Qualys agent got downloaded from?  Which component(s) (VM agent?) talks to what components?  Is the scanner installation done via REST API or simply calling the Qualys standard installer?  Much appreciated!