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<?xml version="1.0"?>
<config>
    <global>
        <events>
            <tnw_salesforce_lead_send_before>
                <observers>
                    <tnw<salesforce_salesforce_lead_send_before>before_observer>
                        <class>tnw_salesforce/observer</class>
                        <method>leadSendBefore</method>
                    </tnw_salesforce_lead_send_before>before_observer>
                </observers>
            </tnw_salesforce_lead_send_before>
        </events>
    </global>
</config>

<?php

/**
 * Class TNW_Salesforce_Model_Observer
 */
class TNW_Salesforce_Model_Observer
{
 
    public function leadSendBefore(Varien_Event_Observer $observer) {
		/** 
		 * Array of Salesforce objects
		 * @var stdClass[] $_data 
		 * 
		 * Example:
		 * array (size=1)
		 *   137 => 
		 *     object(stdClass)[353]
		 *       public 'OwnerId' => string '00524000001veuuAAA' (length=18)
		 *       public 'Email' => string 'mcdermott.candelario.838675@example.net' (length=39)
		 *       public 'FirstName' => string 'Glennie' (length=7)
		 *       public 'LastName' => string 'Ebert' (length=5)
		 *       public 'Company' => string 'Schultz, Murphy and Reynolds' (length=28)
		 *       public 'Phone' => string '(879)100-3821x8268' (length=18)
		 *       public 'Street' => string '003 Erdman Drive Apt. 794' (length=25)
		 *       public 'City' => string 'Davonstad' (length=9)
		 *       public 'PostalCode' => string '11324-3494' (length=10)
		 *       public 'Country' => string 'IE' (length=2)
		 *       public 'LeadSource' => string 'Web' (length=3)
		 *       public 'tnw_mage_basic__Magento_ID__c' => string '137' (length=3)
		 *       public 'HasOptedOutOfEmail' => int 1
		 *       public 'tnw_mage_basic__Magento_Website__c' => string 'a002400000CSEGD' (length=15)
		 */
		$_data = $observer->getData('data');

		// Your custom code
    }
 
}