Filter license types retrieved from database. This will be the defaults if there are no custom license types added.
Parameters:array $license_types
The license types retrieved from the database.
Example usage:
<?php
add_filter( 'slswc_get_license_types', function( $license_types ) {
$license_types['decade'] = array(
'duration' => 'P10Y',
'label' => __( 'Every Ten Years', 'text_domain' ),
);
return $license_types;
});