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The thread regarding coupon workflow suggests that a given coupon can be used to discount a specific line item in an order.
Following the example rules given by the Basic Coupon I'm trying to create a coupon that will do just that. If a given product type is in the cart I would like to take ten percent off it's price, no matter how many times it appears in the cart.
I am completely stumped as to how to achieve this since the "Redeem a Coupon" rules seem to deal with the order as a whole as opposed to line items.
If you could point me in the right direction I'd be more than happy to write it up as an example for the documentation once I get it working.