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Document percentage addon products

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Juerd Waalboer 2023-01-05 20:47:00 +01:00
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plugins/products.pod
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@ -95,3 +95,21 @@ listed as a component named "Product".
A product can have multiple addons. Addon products themselves can also have
further addons, but circular recursion is not supported.
=head3 Percentage addons
As a special case, an addon's price can be a percentage. In this case, the
price is calculated from the sum of the the product components I<up to that
point> that have I<the same contra account> as the percentage addon.
So, given the following example,
example_id 0.90 Example product +some_fee +discount
+some_fee 0.15@+fees Some fee; might be a bottle deposit
+discount -50% Special offer discount!
only 0.45 is discounted, because the 0.15 has a different contra account. While
complicated, this is probably what you want in most cases. There is currently
no way to apply a discount to the product with all of its addons.
A percentage addon must have a product_id that begins with C<+>.