For those who need a form to tell customers a temporary link to verify a site's migration or to check the progress of a site's development without the risk of the link expiring too soon, a link like this can help:
This is a quick link to our home page, where the IP address and Link URL fields will be pre-populated. All you have to do when accessing it is click "Create" and a temporary link to "example.com" will be created.
The domain part can be replaced with a full URL (default protocol is HTTPS). Basically, the accepted format is:
We also offer a cPanel plugin (it also works without a subscription).