Extracting Signing URL from createAndSubscribe

I have a situation whereas I need to pull the URL returned from the createAndSubscribe event and right now it's posting the URL to my endpoint over and over whilst waiting for the signature. Is there another way I can just say, "hey, here is my sign SignIn payload, grab the URL and send it to the user for signing, but like I need to wait for the signing within the event. Does that make any sense at all?