add_action( 'user_register', 'action_before_user_register', 10, 1 );

function action_before_user_register( $user_id ) {
		$username = $user_info->user_login;
		$email = $user_info->user_email;
		// exit();
		if ( isset( $_POST['first_name'] ) ) $query_array['Name'] 	= $_POST['first_name'].' '.$_POST['last_name'];
		else $query_array['Name'] = $username;
		$query_array['Email'] 		= $email;
		$query_array['Customer_Id'] 	= $user_id;
		// print_r($query_array);
		// exit();
		$postdata = http_build_query(
		    $query_array
		);
		$opts = array('http' =>
		    array(
		        'method'  => 'POST',
		        'header'  => 'Content-type: application/x-www-form-urlencoded',
		        'content' => $postdata
		    )
		);
		$context  = stream_context_create($opts);
		$url = server_api.access_token.'/customers/add/';
		$result = json_decode(file_get_contents($url, false, $context));
		update_usermeta( $user_id, 'octopos_cus_id', $result->data->insert_id );
}