function wcfm_mark_fields_as_required($field_names = [], $fields = []) {
    foreach ($field_names as $field_name) {
        if (isset($fields[$field_name])) {
            $fields[$field_name]['custom_attributes'] = ['required' => true];
        }
    }
    return $fields;
}

add_filter('wcfm_marketplace_settings_fields_general', function ($fields) {
    $field_names = [
        'gravatar',
        'banner',
        'store_name',
        'store_email',
        'phone',
    ];
    return wcfm_mark_fields_as_required($field_names, $fields);
});

add_filter('wcfm_marketplace_settings_fields_brand', function ($fields) {
    $field_names = ['shop_description'];
    return wcfm_mark_fields_as_required($field_names, $fields);
});

add_filter('wcfm_wcmarketplace_settings_fields_customer_support', function ($fields) {
    $field_names = [
        'vendor_customer_phone',
        'vendor_customer_email',
        'vendor_csd_return_address1',
        'vendor_csd_return_address2',
        'vendor_csd_return_country',
        'vendor_csd_return_city',
        'vendor_csd_return_state',
        'vendor_csd_return_zip',
    ];
    return wcfm_mark_fields_as_required($field_names, $fields);
});

add_filter('wcfm_vendor_settings_fields_policies', function ($fields) {
    if (isset($fields['wcfm_policy_tab_title'])) {
        $field_names = ['wcfm_policy_tab_title'];
        $fields = wcfm_mark_fields_as_required($field_names, $fields);
    }

    if (isset($fields['wcfm_refund_policy'])) {
        $field_names = ['wcfm_refund_policy'];
        $fields = wcfm_mark_fields_as_required($field_names, $fields);
    }
    return $fields;
});