Magento – Create cart for session via SOAP

The cleanest way to do this is will use observers and custom layout XML. For that you will need to create your own extension. Inchoo has a nice hello world article that should get you started and you can read more about observers in this Magento Board post.

You will need to hook the controller_action_layout_load_before event. Add this to your config.xml.

<controller_action_layout_load_before>
    <observers>
        <[module]>
            <type>singleton</type>
            <class>[module]/observer</class>
            <method>addLayoutHandleObserver</method>
        </[module]>
    </observers>
</controller_action_layout_load_before>

Your Observer would use your code to check for the specific product and if present add a layout handle to the generate Layout XML. This will enable us to target it from a layout xml file.

class [Namespace]_[Module]_Model_Observer
{
    public function addLayoutHandleObserver(Varien_Event_Observer $observer)
    {

        $items = Mage::getSingleton('checkout/session')->getQuote()->getAllItems();

        $logo_cart = false;
        foreach ($items as $_item) 
        {
            $get_attributes = $_item->getProduct()->getTypeInstance(true)->getOrderOptions($_item->getProduct());
            $attributes = $get_attributes['attributes_info'];
            foreach($attributes as $attribute) {
                if($attribute['value'] == 'Has Logo') {
                    $logo_cart = true;
                    break;
                }
            }
           if ($logo_cart) break;
        }

        if ($logo_cart)
        {
            $layout = $observer->getAction()->getLayout();
            $layout->getUpdate()->addHandle('checkout_has_logo');
            $layout->generateXml();
        }

        return $this;
    }
}

Now we can add some custom layout updates from, for example, the local.xml.

<checkout_has_logo>
    <reference name="checkout.onepage">
        <action method="setTemplate"><template>checkout/onepage_logo.phtml</template></action>
    </reference>
</checkout_has_logo>

Not sure if I understood correctly, but you should always create the order before before redirecting to paypal. Then when paypal notifies you that the payment was made the order should change status accordingly.

This is how I would create an order:

$quote = $this->getQuote();

try {
    $quotePayment = $quote->getPayment();

    $quotePayment->setMethod('payment_method_code');
    $quote->setPayment($quotePayment);

    $onePageCheckOut = \Mage::getSingleton('checkout/type_onepage');
    $onePageCheckOut->getCheckout()->setQuoteId($quote->getId());
    $onePageCheckOut->saveOrder();

    $this->redirectUrl = $onePageCheckOut->getCheckout()->getRedirectUrl();
    $quote->setIsActive(false)->save();
} catch (\Exception $e) {
    throw new \Exception(
        $e->getMessage(),
        'some error code'
    );
}

$order = \Mage::getModel('sales/order')->load($onePageCheckOut->getLastOrderId(), 'increment_id');
$order->save();

Then you need to wait for the payment notification and update the order:

//check how to get the params in your case
$paymentId = $this->param('payment_id');
$transactionId = $this->param('transaction_id');

if($order->getStatus() === \Mage_Sales_Model_Order::STATE_CANCELED) {
    //do something if order is cancelled
}

$payment = $order->getPayment();

$amountOrdered = $payment->getAmountOrdered();
$payment->setAmountPaid($amountOrdered);
$payment->setAmountAuthorized($amountOrdered);

/** Save a comment regarding the transaction */
$order->addStatusHistoryComment(
    sprintf(
        "Transaction status: %s / Paypal id: %s",
        strtoupper($this->paymentStatus),
        $paymentId
    )
);
$payment->save();
$order->save();