Which script using Alfacashier.com?
I checked them but They not gona tell me which script they using.
No one actually tells about this thing. Why should they do it? I think anyone would share anything with a possible competitor.
What AlfaCashier is using that's not important, they may be using a bought script and designed it according to their likings or maybe using a custom script made by themselves.
The important thing is how you want to develop your currency exchnage; with a custom script or by buying a ready-made script. If you want custom then go ahead and hire a developer or search for ready-made scripts online.
https://exchangesoftware.info/ this is a site that sales currency exchange scripts. I saw someone mentioned it a few days ago in digital goods board. Though I don't know if they are trusted or not.