Add an extra fee to paypal standard

Question

i am add some extra fee in cart on base of some special conditions.It's work fine all all place in magento but now i think about add this fee to paypal standard.I am successful but it works only if Transfer Cart Line Items = No.

I want to work it where Transfer Cart Line Items = yes in paypal option.

Now i want one row on paypal bill with fee lable & value.

It can come with tax and item total or items and shipping both option are good for me. Can any body help me?

Answer 1

I've managed to add extra lines in PayPal Standard cart using the paypal_prepare_line_items event.

In your module's config.xml:

<config>
    <global>
        <events>
            <paypal_prepare_line_items>
                <observers>
                    <paypal_prepare_line_items>
                        <class>your_module/observer</class>
                        <method>updatePaypalTotal</method>
                    </paypal_prepare_line_items>
                </observers>
            </paypal_prepare_line_items>
        </events>
    </global>
</config>

In your observer:

class Your_Module_Model_Observer
{
    public function updatePaypalTotal(Varien_Event_Observer $observer)
    {
        $feeAmount = <calculated somewhere...>

        /* @var $cart Mage_Paypal_Model_Cart */
        $cart = $observer->getEvent()->getPaypalCart();

        $cart->addItem('Fee label', 1, $feeAmount, 'fee');

        return $this;
    }
}