Magento - apply coupon code automatically config.xml

config.xml

<frontend>
	<events>
		<checkout_cart_product_add_after>  
		<observers>  
			<ApplyCoupon_apply>
				<type>singleton</type>  
				<class>ApplyCoupon/Observer</class>    
				<method>applyCouponEvent</method>            
			</ApplyCoupon_apply>              
		</observers>  
		</checkout_cart_product_add_after>
	</events>
	<routers>
		<applycoupon>
			<use>standard</use>
			<args>
				<module>You_ApplyCoupon</module>
				<frontName>applycoupon</frontName>
			</args>
		</applycoupon>
	</routers>
</frontend>