Collateral

I wrote a simple module that puts a server online via remote api. But now I wonder how I know when the server is actually online and operational. Is there a way for the server to send a notification to WHMCS, and the latter to perform operations before making the product operational on the client panel? For example, at the end of the server boot, the newly started server sends an API call to WHMCS which performs some operations (upload, restart systemctl services)