gist.md

function add_pp_args($args){

	$ppamt = $args['amount_1'] + $args['tax_cart'];
	$ppamt = ( ($ppamt * .026) + .30 ); 
	$ppamt = number_format((float)$ppamt, 2, '.', '');
	//remove debug
	foreach($args as $key => $val) if( substr($key,-2) == '_2' ) unset($args[$key]);
	$args['item_name_2'] = "Booking and Service Fee";
	$args['amount_2'] = $ppamt;
	$args['quantity_2'] = 1;
	return $args;
}

add_filter('FHEE__EEG_Paypal_Standard__set_redirection_info__arguments','add_pp_args');