gistfile1.php

public function createVoucher($value=0, $cardnumber){
			
			$voucher_id = Mage::getModel('salesrule/coupon')->load($cardnumber . '-' . Mage::helper('checkout')->getQuote()->getId(), 'code');
			if($voucher_id->getRuleId()){
				$cartpriceRule = Mage::getModel('salesrule/rule')->load($voucher_id->getRuleId());
				$cartpriceRule->setDiscountAmount($value);
			}else{
				$cartpriceRule = Mage::getModel('salesrule/rule');	
				$cartpriceRule->setName('Giftcard '. $cardnumber);
				$cartpriceRule->setDescription('Giftcard '. $cardnumber);
				$cartpriceRule->setIsActive(1);
				$cartpriceRule->setWebsiteIds(array(1,2));
				$cartpriceRule->setCustomerGroupIds(array(0,1,2,3,4));
				$cartpriceRule->setFromDate('');
				$cartpriceRule->setToDate('');
				$cartpriceRule->setSortOrder('');
				$cartpriceRule->setSimpleAction('cart_fixed');
				$cartpriceRule->setDiscountAmount($value);
				$cartpriceRule->setStopRulesProcessing(0);
				$cartpriceRule->setApplyToShipping(1);
				$cartpriceRule->setCouponType(2);
				$cartpriceRule->setUsesPerCoupon('1');
				$cartpriceRule->setUsesPerCustomer('1');
				$cartpriceRule->setCouponCode($cardnumber . '-' . Mage::helper('checkout')->getQuote()->getId());
				$cartpriceRule->setStoreDefaultLabel('Giftcard ('.$cardnumber.')');
				
			}
			
			$cartpriceRule->save();
			$rule_id = $cartpriceRule->getId();
			$shoppingCartPriceRule = Mage::getResourceModel('salesrule/rule')->saveStoreLabels($rule_id,array('0'=>'Giftcard ['.$cardnumber.']'));
			
			$card_number = $cardnumber . '-' . Mage::helper('checkout')->getQuote()->getId();
			Mage::helper('checkout')->getQuote()->setCouponCode($card_number);
			return $card_number;
	}