Sharing Laravel cookies across subdomains

I recently ran into a problem where I had a suite of applications hosted on a set of subdomains that all needed to be able to share a single cookie. Any cookies other than the shared cookie needed to stay specific to their subdomain, but this one shared cookie needed to be accessible to any of them. I also wanted to accomplish this using Laravel's `Cookie` facade.
https://gistlog.co/JacobBennett/15558410de2a394373ac

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