array(
'number' => 'null',
'orderby' => 'title',
'order' => 'ASC',
'columns' => '4',
'hide_empty' => '1',
'parent' => '',
'ids' => ''
)
The number field is used to display the number of products and the ids field is to tell the shortcode which categories to display.
[product_categories number="12" parent="0"]