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I want to do some customisation to cart on submit coupon code from cart, for this I added controller_action_postdispatch_checkout_cart_couponPost event and there I want to get coupon code and check its validation, if it is not valid then I want to apply some custom discount to cart.

But How to get coupon code here and check validity of it in event controller_action_postdispatch_checkout_cart_couponPost ?

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Mage::app()->getRequest()->getParam('coupon_code');

Take a look at \Mage_Checkout_CartController::couponPostAction at how Magento natively deals with the coupon codes.

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  • Hello @nikola99, Mage::app()->getRequest()->getParam('coupon_code') working for getting coupon_code but how to check its validity?
    – Vinaya Maheshwari
    Commented Jan 16, 2017 at 4:30

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