Example of how to hook into inbound_store_lead_post action hook

functions.php

<?php


/**
*  inbound_store_lead_post runs as an ajax call during a tracked form submission
*
*   Use $lead data in crafting 3rd party connection
*/

add_action('inbound_store_lead_post','extension_send_data');
function extension_send_data( $lead )
{		
	
	/* URL we want to send the data to */
	$external_url = "http://www.remoteservice.com/api/";
	
	/* Uncomment this line print all contents of $lead to your PHP's error_log file for review */
	//error_log( print_r( $lead , true ) );
	
	$response = wp_remote_post( $external_url , array(
			'method' => 'POST',
			'timeout' => 20,
			'redirection' => 5,
			'httpversion' => '1.0',
			'blocking' => true,
			'headers' => array(
				'Content-Type' => 'application/json',
				),
			'cookies' => array(),
			'body' => json_encode($lead)
		)
	);
		
	/* Uncomment this line print the 3rd party response to your PHP's error_log file */
	//error_log( print_r( $response , true ) );			
}