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Apply discount on shipping cost according to order value


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I would like to reduce the price of the shipping (all carriers) according to the cart value.

I think to do it can override the cart classes but there are several functions and I want to make sure by overriding the classes then the modified shipping cost to be taken into account at all the other stages (payment, invoice...) and not create problem with payments...


Which functions do I need to modify

- getTotalShippingCost

- getCarrierCost

- getOrderShippingCost

- getPackageShippingCost


Thx by advance for your help

Edited by tmbiz (see edit history)
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