Plugin:
https://www.zen-cart.com/downloads.php?do=file&id=1917

Got this question via PM (please do not PM me for support)
I have installed this but before enabling want to know if it is a Global program for every customer (I have over 3,800 website accounts) or if I can exclude some who may already have a preferred pricing structure?
The read me is pretty basic and admin only allows me to set up calendar segments, taxes, shipping and discount amounts.
Also, is there a way to let customers know a program is in place other than emailing them individually to announce (other than social media of course)
Thank you for your answers and recent update to the plug in.
This is a basic plugin, the discounts apply to every customer.
If you want to restrict it to certain customers only you would have to write the desired logic yourself.
To let ciustomers know about the program you could simply create a define page or EZ page to promote the loyalty program.