Google Product Taxonomy module provides the following features:
- new Google Product Taxonomy vocabulary
2 new field and field instances for this vocabulary:
google_product_taxonomy_idgoogle_product_taxonomy_path
admin page to import hierarchical Google Product categories into this vocabulary (and to delete them if necessary) using Drupal batch functionality
This vocabulary could be later used with Drupal Commerce or any other similar solution to add Google Product Taxonomy fields to product entities, to facilitate their export to Google Merchant in google_product_category element.