2.6. Product Discounts
Product discounts can be set upon display of any page. The discounts apply only to the customer receiving them, and are of one of three types:
1. A discount for one particular item code (key is the item-code)
2. A discount applying to all item codes (key is ALL_ITEMS)
3. A discount for an individual line item (set the mv_disount attribute
with embedded Perl)
4. A discount applied after all items are totaled
(key is ENTIRE_ORDER)
The discounts are specified via a formula. The formula is scanned for the variables $q and $s, which are substituted for with the item quantity and subtotal respectively. The variable $s is saved between iterations, so the discounts are cumulative. In the case of the item and all items discount, the formula must evaluate to a new subtotal for all items of that code that are ordered. The discount for the entire order is applied to the entire order, and would normally be a monetary amount to subtract or a flat percentage discount.
Discounts are applied to the effective price of the product, including any quantity discounts or price adjustments.
To apply a straight 20% discount to all items:
[discount ALL_ITEMS] $s * .8 [/discount]
or with named attributes:
[discount code=ALL_ITEMS] $s * .8 [/discount]
To take 25% off of only item 00-342:
[discount 00-342] $s * .75 [/discount]
To subtract $5.00 from the customer's order:
[discount ENTIRE_ORDER] $s - 5 [/discount]
To reset a discount, set it to the empty string:
[discount ALL_ITEMS][/discount]
Perl code can be used to apply the discounts, and variables are saved between items and are shared with the [calc] tag. This example gives 10% off if two items are ordered, with 5% more for each additional up to a maximum of 30% discount:
[calc]
[item-list]
$totalq{"[item-code]"} += [item-quantity];
[/item-list]
return '';
[/calc]
[item-list]
[discount code="[item-code]"]
return ($s) if $totalq{"[item-code]"} == 1;
return ($s * .70) if $totalq{"[item-code]"} > 6;
return ($s * ( 1 - 0.05 * $totalq{"[item-code]"} ));
[/discount]
[/item-list]
Here is an example of a special discount for item code 00-343 which prices the second one ordered at 1 cent:
[discount 00-343]
return $s if $q == 1;
my $p = $s/$q;
my $t = ($q - 1) * $p;
$t .= 0.01;
return $t;
[/discount]
If you want to display the discount amount, use the [item-discount] tag.
[item-list]
Discount for [item-code]: [item-discount]
[/item-list]
Finally, if you want to display the discounted subtotal, you need to use the [calc] capability:
[item-list]
Discounted subtotal for [item-code]: [currency][calc]
[item-price] * [item-quantity]
[/calc][/currency]
[/item-list]