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<?xml version="1.0"?>
<config>
    <global>
        <events>
            <tnw_salesforce_invoice_notes_send_before>
                <observers>
                    <salesforce_invoice_notes_send_before_observer>
                        <class>tnw_salesforce/observer</class>
                        <method>salesforceInvoiceNotesSendBefore<<method>invoiceNotesSendBefore</method>
                    </salesforce_invoice_notes_send_before_observer>
                </observers>
            </tnw_salesforce_invoice_notes_send_before>
        </events>
    </global>
</config>

<?php

/**
 * Class TNW_Salesforce_Model_Observer
 */
class TNW_Salesforce_Model_Observer
{
 
    public function salesforceInvoiceNotesSendBeforeinvoiceNotesSendBefore(Varien_Event_Observer $observer) {
		/**
		 * Array of Salesforce objects
		 * @var stdClass[] $_data
		 */
		$_data = $observer->getData('data');

		// Your custom code
    }
 
}