woocommerce_resurs_bank_' . $type . '_checkout_icon (iconified method)

Payment method based filter. Could be handy to import such method (and be backward-compatible) to automatically display custom icons.

$icon = apply_filters(
 'woocommerce_resurs_bank_' . $type . '_checkout_icon',
 $plugin_url . '/img/' . $icon_name . '.png'
);

https://github.com/Tornevall/wpwc-resurs/issues/33

33 is the magic number!