Start with the product facts a buyer needs. If those facts only appear after several browser requests, inspect what your server sends before treating the product page as technically ready.
Try one product you know well
Open a published product, then search View Page Source for its exact name and one specification, such as a material or size. Can you find the details that a buyer sees on screen? If you only find a loading message and scripts, ask how the product data is delivered. Repeat the check on another product before changing the whole store.
Align the visible information and structured data
When you add product markup, keep it consistent with the actual page and update it when details change. Avoid invented ratings or stale values copied across products. Check both the template and a live product because missing database fields can produce different output for individual items.
Use discovery to check the public inventory
List concrete product URLs in a sitemap and link from relevant categories. SiteReadyFor.SI can inspect the discovered pages’ HTML and JSON-LD within the chosen scope. It does not verify your inventory system, run a checkout, or measure whether a shopping assistant recommends the product.