This filter allows you to customize the fields in the “Store Details” section.
$meta_fields - (array) The current meta box fields.
This example creates an additional tab called “Filter Input Example” using all the supported field types:
The names of the fields like my_textinput and my_checkbox are prefixed with wpsl_ before they saved as post meta data.
There is a wpsl_metabox_” . $field_type . “_input action hook available in case you need to handle a custom field type.
This filter is located in /admin/class-metaboxes.php.
The code needs to be placed in the functions.php file inside your active theme folder.