# GEO Knowledge Base > Expert guides by audit zone to understand, measure, and fix every AI-commerce signal on Shopify. - Canonical HTML: https://verityscore.io/en/kb/ - Markdown alternate: https://verityscore.io/en/kb.md - Language: en - Updated: 2026-04-28 ## Critical Blocking issues for AI visibility. - [What is Agentic Commerce? Complete Guide 2026](https://verityscore.io/en/kb/what-is-agentic-commerce/) : GEO: Autonomous AI agents search, compare, and buy for consumers. Understand ACP, UCP, and how to prepare your Shopify store. - [Schema.org Product for Shopify: Required Fields & Common Mistakes](https://verityscore.io/en/kb/schema-org/) : Schema.org: 12 required fields, 8 common mistakes, and how schema.org directly impacts AI recommendations. Validation checklist for Shopify merchants. - [The LLM Landscape in 2026: 15 AI Systems Reading Your Product Pages](https://verityscore.io/en/kb/llm-landscape-ecommerce/) : AI Landscape: Beyond ChatGPT and Perplexity: Mistral, Claude, Gemini, Meta AI, Grok, DeepSeek, and MCP agents. Who reads what, how to appear everywhere. - [robots.txt for AI Crawlers: Stop Blocking Search & Shopping Bots](https://verityscore.io/en/kb/robots-crawlers/) : Robots.txt: Your Shopify robots.txt may block ChatGPT and Perplexity from seeing your products. How to separate search, user, training, and ads-validation bots. - [Shopify Reviews Invisible to AI: Technical Guide 2026](https://verityscore.io/en/kb/aggregate-rating/) : Reviews: Are your Loox, Judge.me, Yotpo reviews readable by ChatGPT, Perplexity, Mistral? Analysis per app, per AI crawler, and server-side fix paths. - [Free GEO Audit for Shopify: Check Your AI Visibility in 5 Minutes](https://verityscore.io/en/kb/geo-audit/) : GEO: Is your Shopify store visible to ChatGPT, Perplexity, and Google AI Mode? Free audit with 4 pillars, 9 factors, and actionable fixes. - [Sell on ChatGPT Shopping: 8 Criteria Your Shopify Store Must Meet](https://verityscore.io/en/kb/sell-on-chatgpt-shopify/) : Agentic Commerce: Case study: Shopify store went from 35 to 78/100 AI readiness. 8 criteria, actionable checklist, and Agentic Storefronts setup for 2026. - [Agentic Commerce Protocol (ACP): Sell Through ChatGPT Agents](https://verityscore.io/en/kb/acp-agentic-commerce-protocol/) : ACP: How ACP powers ChatGPT Shopping and autonomous purchasing. Enable it on Shopify, audit your readiness, ACP vs UCP compared. - [UCP and Shopify Storefront Catalog MCP: What to Verify](https://verityscore.io/en/kb/ucp-universal-commerce-protocol/) : UCP: Shopify's official 2026 agentic catalog surface: /api/ucp/mcp, search_catalog, lookup_catalog, get_product, and catalog truth checks. - [ChatGPT App for Shopify: Build Your Own Branded AI](https://verityscore.io/en/kb/chatgpt-app-shopify/) : Agentic Commerce: How Shopify merchants can build a dedicated ChatGPT App with loyalty, guided selling, and brand voice. Step-by-step guide, costs, and real examples. ## High priority Important signals to fix for maximum recommendability. - [GEO Readiness Score: 9 Factors That Determine Your AI Visibility](https://verityscore.io/en/kb/geo-readiness/) : GEO: Your GEO Score measures how visible your Shopify store is to ChatGPT, Perplexity, and Google AI. 9 factors explained with optimization tips. - [Shopify Agentic Storefronts: the 4 official eligibility criteria](https://verityscore.io/en/kb/shopify-agentic-storefronts-eligibility/) : agentic-commerce: Why your Shopify admin shows 'Agentic storefronts aren't available' and how to fix the 4 Shopify criteria: US sales, products in Catalog, Supplemental Terms, policies. 100% sourced from Shopify Help Center. - [AI Buyer Score: The Shopping Agent Checklist](https://verityscore.io/en/kb/ai-buyer-score/) : AI Buyer: How an AI shopping agent evaluates your Shopify store. The 9 recommendability criteria and how to go from 'not recommended' to 'recommended'. - [Chrome Skills: Configure Google's New AI Product Comparator (2026 Guide)](https://verityscore.io/en/kb/chrome-skills-shopify/) : AI Visibility: Step-by-step guide to enable Chrome Skills, create reusable Gemini prompts, and understand what it means for your Shopify store's AI visibility. - [GEO vs SEO: What's the Difference for E-commerce?](https://verityscore.io/en/kb/geo-vs-seo/) : GEO: SEO optimizes for blue links, GEO for AI answers. Differences, complementarities, and why GEO is essential for Shopify merchants in 2026. - [Golden Record: Product Data Completeness for AI Commerce](https://verityscore.io/en/kb/golden-record/) : Scoring: The Golden Record measures 34 product attributes across 7 categories. At 95%+, your AI visibility multiplies 3-4x. Complete checklist inside. - [AEO vs GEO vs SEO: clarifying the acronyms in 2026](https://verityscore.io/en/kb/aeo-vs-geo-vs-seo/) : AEO: AEO, GEO, SEO: what each term really covers, what overlaps, what diverges. Sourced comparison table with Q1 2026 numbers. - [Claims & Proof: How AI Agents Verify Your Product Claims](https://verityscore.io/en/kb/claims-proof/) : Claims: AI agents fact-check your marketing claims before recommending products. Learn how claims detection, proof verification, and credibility scoring work. - [Multi-market price drift on Shopify: why AI agents downrank your store](https://verityscore.io/en/kb/multi-market-price-drift/) : Multi-market: When your EUR price doesn't match your GBP/USD price coherently, ChatGPT Shopping, Perplexity Buy and Google AI Mode downrank your products. How to detect and fix on the Shopify Markets side. - [E-E-A-T Signals for AI: How Agents Evaluate Trust](https://verityscore.io/en/kb/eeat-signals-ai/) : Trust: AI agents evaluate your store like Google evaluates E-E-A-T. Discover the trust signals that determine whether AI recommends your products. - [How to Appear in Perplexity Shopping | Shopify Checklist (2026)](https://verityscore.io/en/kb/perplexity-shopping/) : Perplexity: 7 requirements to get your products recommended by Perplexity AI. Checklist, common mistakes, and readiness score for Shopify merchants. - [Pricing and AI Visibility: How Agents Compare Your Products](https://verityscore.io/en/kb/pricing-ai-visibility/) : Commerce: AI agents compare prices before recommending. Expose your pricing, promotions, and compareAtPrice for ChatGPT Shopping, Perplexity, and Google AI. ## Optimization Improvements that strengthen AI agent trust. - [llms.txt for Shopify: Useful AI Discovery File, Not a Primary Ranking Signal](https://verityscore.io/en/kb/llms-txt/) : llms.txt: What is llms.txt, why it can help AI discovery, and why Shopify merchants should prioritize HTML, schema.org, sitemap, internal links and proof first. - [Conversational Content: Writing for Humans AND AI](https://verityscore.io/en/kb/conversational-content/) : Content: How to structure your Shopify product page content so it's both engaging for humans and actionable for AI agents. - [Shipping & Returns: Critical Trust Signals](https://verityscore.io/en/kb/shipping-returns/) : Policies: Shipping and return policies are major trust signals for AI agents. How to make them visible and verifiable on Shopify.