How can i use dynamic url for XERO call back url

i have developed php laravel 5 web application. i need to connect with XERO account software. this application is public application . further domain is change with each account. use sub domain for each application. how i set call back url.

1. PHP Laravel 5 web application.
2. Public application.
3. Url is change for each account. (Eg:- http://ift.tt/2dKpn6t , http://ift.tt/2d6VVJS)
4. Need to connect with Xero.
5. How i provide Call back Url.

via Chebli Mohamed