I spoke too soon. I ended up with an error:

PHP Warning: Missing argument 1 for currencies::get_decimal_places(), called in /var/www/vhosts/buydentalequipment.com/httpdocs/includes/modules/order_total/ot_coupon.php on line 507 and defined in /var/www/vhosts/buydentalequipment.com/httpdocs/includes/classes/currencies.php on line 108

It would appear as though get_decimal_places requires a parameter which isn't present.

In ot_coupon.php I found the bug and fixed it.. although I'm fairly sure I did it the wrong way :)

PHP Code:
    // this line was coded wrong.. hard coded it to two for now until I can figure out what is supposed to be sent in with it.
    //$prec = $currencies->get_decimal_places();
    
$prec 2