Live check of one product page for Google Merchant Center readiness. Pass ?url=<product page>. Returns parsed schema.org Product/Offer (name, image, price, currency, availability, brand, GTIN/MPN, condition), og:price vs JSON-LD price mismatch, return/shipping markup, per-field ok/missing with GMC impact and a ready/fix_required verdict. Use before submitting a feed or appealing a price-mismatch d