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<?xml version="1.0"?>
<config>
    <global>
        <events>
            <tnw_salesforce_invoice_send_before>
                <observers>
                    <salesforce_invoice_send_before_observer>
                        <class>tnw_salesforce/observer</class>
                        <method>salesforceInvoiceSendBefore<<method>invoiceSendBefore</method>
                    </salesforce_invoice_send_before_observer>
                </observers>
            </tnw_salesforce_invoice_send_before>
        </events>
    </global>
</config>

<?php

/**
 * Class TNW_Salesforce_Model_Observer
 */
class TNW_Salesforce_Model_Observer
{
 
    public function salesforceInvoiceSendBeforeinvoiceSendBefore(Varien_Event_Observer $observer) {
		/**
		 * Array of Salesforce objects
		 * @var stdClass[] $_data 
		 * 
		 * Example:
		 * array (size=1)
		 *   103000007 => // Magento order number
		 *     object(stdClass)[580]
		 *       public 'AcctSeed__Status__c' => string 'In Process' (length=10)
		 *       public 'tnw_aseed__Magento_Website__c' => string 'a002400000CSEGD' (length=15)
		 *       public 'tnw_aseed__Magento_ID__c' => string '103000007' (length=9)
		 *       public 'AcctSeedERP__Sales_Order__c' => string 'a1524000004B2jNAAS' (length=18)
		 *       public 'AcctSeed__Customer__c' => string '0012400000Q0YeMAAV' (length=18)
		 *       public 'AcctSeed__Billing_Contact__c' => string '0032400000M41eDAAR' (length=18)
		 */
		$_data = $observer->getData('data');

		// Your custom code
    }
 
}