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I added a Module that adds an extra Fee (via Discount) when I order products for less than 50€. That module works for invoice payment. When i want to pay via PayPal, I get an error like "there is a mistake"...

How can archive that? My idea was to create an observer that modifies the Paypal-Information... But how exactly i can make that?

I tried the following code:

public function paypalPrepareLineItems($observer)
    {
        /* @var $cart Mage_Paypal_Model_Cart */
        $cart = $observer->getEvent()->getPaypalCart();
        $address = $cart->getSalesEntity()->getIsVirtual() ?
            $cart->getSalesEntity()->getBillingAddress() : $cart->getSalesEntity()->getShippingAddress();
        $feeAmount = $address->getExtraFeeRuleAmount();
        $cart->updateTotal(Mage_Paypal_Model_Cart::TOTAL_DISCOUNT, $feeAmount);
    }

Thank you, Chris

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