Checkout: Filter - checkout_processing_output Example

gistfile1.php

<?php

// Change the "Processing Order..." output on the payment page of the checkout procedure

function processing_output($html = null, $pmethod = null) {
	// Change $html here as needed
	$html = 'New text or html for the payment page...';
	return $html;
}

add_filter('checkout_processing_output', 'processing_output', 10, 2);

?>