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<?xml version="1.0"?>
<config>
    <global>
        <events>
            <tnw_salesforce_invoice_notes_send_after>
                <observers>
                    <salesforce_invoice_notes_send_after_observer>
                        <class>tnw_salesforce/observer</class>
                        <method>salesforceInvoiceNotesSendAfter<<method>invoiceNotesSendAfter</method>
                    </salesforce_invoice_notes_send_after_observer>
                </observers>
            </tnw_salesforce_invoice_notes_send_after>
        </events>
    </global>
</config>

<?php

/**
 * Class TNW_Salesforce_Model_Observer
 */
class TNW_Salesforce_Model_Observer
{
 
    public function salesforceInvoiceNotesSendAfterinvoiceNotesSendAfter(Varien_Event_Observer $observer) {
		/**
		 * Array of Salesforce objects
		 * @var stdClass[] $_data 
		 *
		 * Example:
		 * array (size=1)
		 *   1 => 
		 *     object(stdClass)[843]
		 *       public 'ParentId' => null
		 *       public 'IsPrivate' => int 0
		 *       public 'Body' => string 'Custom comment' (length=14)
		 *       public 'Title' => string 'Custom comment' (length=14)
		 */
		$_data = $observer->getData('data');

		/**
		 * Array of Results
		 * @var stdClass[] $_result
		 * Example:
		 * array (size=1)
		 *   1 => 
		 *     object(stdClass)[855]
		 *       public 'created' => boolean true
		 *       public 'id' => string '00224000002qNvJAAU' (length=18)
		 *       public 'success' => boolean true
		 */
		$_result = $observer->getData('result');

		// Your custom code
    }
 
}