<?php

/**
 */
$installer = $this;
/* @var $installer Mage_Catalog_Model_Resource_Eav_Mysql4_Setup */
$sort_order = 0;
foreach (Intex_Yandex_Model_Offers_VendorModel::getUsedAttributes() as $code => $attr) {
    $attr['sort_order'] = $sort_order++;
    $installer->addAttribute('catalog_product', $code, $attr);
}
$installer->updateAttribute('catalog_product', 'manufacturer', 'is_required', 1);
<?php

/**
 */
$installer = $this;
/* @var $installer Mage_Catalog_Model_Resource_Eav_Mysql4_Setup */
$sort_order = 0;
$attributs = Intex_Yandex_Model_Offers_VendorModel::getUsedAttributes();
$attributs['sales_notes']['sort_order'] = count($attributs);
$installer->addAttribute('catalog_product', 'sales_notes', $attributs['sales_notes']);