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This question already has an answer here:

I want to set the tax value to 0 when order is placed through sage pay.I get the value by

Mage::helper('checkout')->getQuote()->getShippingAddress()->getData('tax_amount');

but unfortunately I am not able to set the data as per my wish please help me how to change it.

marked as duplicate by Marius Jan 27 '15 at 15:26

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