result.productResults automatically: no flag, no extra credits, since the panel is already in the HTML the scrape fetches.

Right-rail product panel on the Google SERP
stores[]. This panel is separate from the main-column “Popular products” and “More products” grids, which remain shopping cards — both can appear on the same SERP.
Same shape as AI Mode product results, which are opt-in via include.expandProducts and billed per cluster.
Product result structure
Each entry describes one product cluster and its merchant offers.
Only
title is guaranteed — anything Google’s panel omits is left out of the object rather than sent as null. Panels can also carry brand, rating, reviews, priceRange, typicalPrices, variants, relatedProducts, userReviews, videos, discussionsAndForums and highlights, emitted under those names when present, though most carry none of them.
Specifications
A category name mapped to a flat set of spec key/value pairs:Store structure
Expect the first six on most offers and the rest only occasionally. Everything beyond
name is optional and omitted when absent — Google shows different combinations per merchant, so an “Out of stock” listing may have no price or link at all.