This filter allows you to customize which store meta fields are available in the info window template on individual store pages.
$meta_fields - (array) The current meta fields.
$store_id - (integer) The id of the current store.
In this example the value of the “wpsl_my_textinput” post meta field is added to the available meta fields under the “my_textinput” key:
This filter is located in /frontend/class-frontend.php.
The code needs to be placed in the functions.php file inside your active theme folder.