Signing URL expiration

Signing URL does not expire and thats the advantage over the session token. You can read about it in this article - https://developer.esignlive.com/guides/feature-guides/signing-url/ When you say, is it configurable? what way you are expecting? The API response itself is so easy, it already frames a URL for you and give it, not sure about your requirement, but I do not see the necessity to have it as configurable item.