Filtering Merchant Gateway button images–not found?

Hi–

I’ve followed the instructions at https://quirm.net/wiki/eshop/additional-plugins-and-code-snippets/change-merchant-gateway-images/ but I’ve apparently missed something.

When the wiki says to upload the new images to “your theme’s images folder,” I’m assuming that’s [theme]/assets/images, yes?

I’ve confirmed that the PNG files are there, and my theme functions.php has this:

add_filter('eshop_merchant_img_bank', 'my_icon_bank');
function my_icon_bank() {
	$icon = array(
		'path'=>get_stylesheet_directory(). '/images/bank.png',
		'url'=>get_stylesheet_directory_uri(). '/images/bank.png'
	);
	return $icon;
}

add_filter('eshop_merchant_img_cash', 'my_icon_cash');
function my_icon_cash() {
	$icon = array(
		'path'=>get_stylesheet_directory(). '/images/cash.png',
		'url'=>get_stylesheet_directory_uri(). '/images/cash.png'
	);
	return $icon;
}

add_filter('eshop_merchant_img_paypal', 'my_icon_paypal');
function my_icon_paypal() {
	$icon = array(
		'path'=>get_stylesheet_directory(). '/images/paypal.png',
		'url'=>get_stylesheet_directory_uri(). '/images/paypal.png'
	);
	return $icon;
}

…but I’m still getting “broken image” icons where those buttons are supposed to be.

What am I missing?

Thanks,

David

https://www.ads-software.com/plugins/eshop/