The Update Store Stock function enables the ability to change a product's
availability status in a store. The availability options include "available,"
"out of stock," and "discontinued."
Only products marked as "available" will be included in recognition results,
while products marked as "out of stock" or "discontinued" will be filtered out.

The response product_stock_states contains the complete stock state for the
store, including products that have not had a stock state set. Products
without an explicit stock state are returned as "available".
updated_product_ids lists the products changed by this request and
invalid_product_ids lists any requested product ids that could not be found.