php - Automatic invoicing in magento

Answer

Solution:

The best approach to this would be register an Observer to an Event thrown during the payment capture process, but I'm not seeing too many relevant ones unfortunately. You could trysales_order_invoice_save_before to intercept the save(), but I'm not keen on that as it may confuse the controller(s) as to why the invoice save failed.

Looking through the Paypal code, you will see inMage_Paypal_Model_Ipn::_processOrder() that it calls$this->_registerPaymentCapture() on success, which in turn calls$payment->registerCaptureNotification().

Mage_Sales_Model_Order_Payment::registerCaptureNotification($amount) creates a new invoice if one doesn't already exist and the payment is the full amount of the order. It uses the_isCaptureFinal($amount) method to verify this.

One option would be to extendMage_Sales_Model_Order_Payment and override_isCaptureFinal($amount) with code along the lines of:

foreach($this->getOrder()->getAllItems() as $oOrderItem){
  if($oOrderItem()->getProduct()->getTypeId() == 'your_custom_product_type'){
    return false;
  }
}
return parent::_isCaptureFinal($amountToCapture);
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Don't forget the final call to parent!!

You would do all this in a custom module (start with the ModuleCreator if you want), and insert the following into the config.xml

<global>
    <models>
        <modulename>
            <class>Namespace_Modulename_Model</class>
        </modulename>
        <sales>
            <rewrite>
                <order_payment>Namespace_Modulename_Model_Order_Payment</order_payment>
            </rewrite>
        </sales>
    </models>
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Standard disclaimers apply, you're messing with funds transactions here, so makes sure that you test it really really thoroughly.

Note that this approach will apply to all payment methods that callMage_Sales_Model_Order_Payment::registerCaptureNotification($amount), not just Paypal.

Good Luck,
JD