How to add Charges to shipping method in Magento - magento

Question

I followed the steps in creating a payment method in this tutorial (http://www.magentocommerce.com/wiki/5_-_modules_and_development/payment/create-payment-method-module) everything works fine, but i need an additional functionality.
additional 6% charge to the total if the payment method is selected.
I also use this module - http://www.magentocommerce.com/magento-connect/payment-method-charge-4050.html but I need 2 condition. That is why I created new payment method.
1st payment method - 6% charge
2nd payment method - 2% charge
Thanks in advance.

Answer 1

More than likely your going to want to just create an observer to do what your are needing:
You'll need to look around for the proper observer event to hook into, however here is an example observer method:
public function updateShippingAmount( $observer )
{
$MyPaymentMethod = Mage::getSingleton('namespace/mypaymentmethod');
$order = $observer->getEvent()->getOrder();
$payment = $order->getPayment()->getData();
if( $payment['method'] == $MyPaymentMethod->getCode() )
{
$shipping_amount = $order->getShippingAmount();
$order->setShippingAmount( $shipping_amount + $MyPaymentMethod->getPostHandlingCost() );
}
}
Taken from this article:
http://www.candesprojects.com/magento/add-payment-method-handling-cost/
More reading on how to create an observer:
http://www.magentocommerce.com/wiki/5_-_modules_and_development/0_-_module_development_in_magento/customizing_magento_using_event-observer_method

Answer 2

Recently I have the same requirement and I fixed by implementing event-observer method.
In fact you can add any additional shipping cost to any shipping method for any condition by implementing event called sales_quote_collect_totals_before
And the observer model method(dummy code though) looks like:
public function salesQuoteCollectTotalsBefore(Varien_Event_Observer $observer)
{
/**#var Mage_Sales_Model_Quote $quote */
$quote = $observer->getQuote();
$someConditions = true; //this can be any condition based on your requirements
$newHandlingFee = 15;
$store = Mage::app()>getStore($quote>getStoreId());
$carriers = Mage::getStoreConfig('carriers', $store);
foreach ($carriers as $carrierCode => $carrierConfig) {
if($carrierCode == 'fedex'){
if($someConditions){
Mage::log('Handling Fee(Before):' . $store->getConfig("carriers/{$carrierCode}/handling_fee"), null, 'shipping-price.log');
$store->setConfig("carriers/{$carrierCode}/handling_type", 'F'); #F - Fixed, P - Percentage
$store->setConfig("carriers/{$carrierCode}/handling_fee", $newHandlingFee);
###If you want to set the price instead of handling fee you can simply use as:
#$store->setConfig("carriers/{$carrierCode}/price", $newPrice);
Mage::log('Handling Fee(After):' . $store->getConfig("carriers/{$carrierCode}/handling_fee"), null, 'shipping-price.log');
}
}
}
}