Google UCP Integration

Make Your Shop AI-Ready with Google UCP

Google's Universal Commerce Protocol lets AI agents browse your shop, add products to the cart and complete purchases – without a classic checkout page. I build the UCP endpoints for your existing shop.

  • UCP Discovery Layer: manifest files, ai-catalog.json, agents.md
  • UCP Transaction APIs: Cart, Checkout, Payment Token, Webhooks
  • Compatible with Shopware, WooCommerce and custom backends
  • Based in Basel, Switzerland – personal support in English or German

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100% free & non-binding

The Challenge

Does this sound familiar?

Your shop is invisible to AI agents

Gemini, ChatGPT and other AI assistants can already recommend and purchase products – but only in shops that speak the UCP protocol. Without it, your shop simply doesn't exist for these new buyers.

Shopify has it built in – you don't

Shopify merchants get UCP support out of the box. If you run Shopware, WooCommerce or a custom backend, you need custom development to stay competitive.

The protocol is new and complex

UCP combines two technical layers – Discovery and Transaction – with specific manifest files, API endpoints, payment tokens and webhook integrations. Setting this up correctly requires deep backend experience.

My Services

UCP integration for your existing shop

Vincent Kilchherr - UCP Entwickler Basel

Backend developer with e-commerce experience

I'm Vincent Kilchherr – a freelance web developer from Basel. I specialise in backend integrations and have been building API-driven commerce solutions for over 15 years.

Google's Universal Commerce Protocol (UCP) is the open standard that allows AI agents – including Gemini, ChatGPT and others – to interact directly with online shops: browsing products, adding items to the cart, going through checkout and paying. It has two layers: the Discovery Layer (manifest files that make your shop readable for AI) and the Transaction Layer (APIs that execute the actual purchase flow). I build both for shops running on Shopware, WooCommerce and custom backends.

Discovery Layer

Make your shop discoverable by AI

The Discovery Layer is the foundation of UCP. I create all required manifest and catalog files so AI agents can find, understand and navigate your shop – products, categories, pricing and availability included.

  • .well-known/ucp endpoint, agents.md and llms.txt
  • ai-catalog.json with live product data from your shop system
  • Structured markup for AI-readable product and category pages
UCP Discovery Layer
Transaction APIs

Let AI agents complete purchases

The Transaction Layer is where the actual buying happens. I develop the Cart API, Checkout API, Payment Token handling, Identity Linking and Webhooks – so AI agents can run the full purchase flow in your shop without a human ever touching a checkout page.

  • Cart API and Checkout API for autonomous agent-driven purchases
  • Payment Token and Identity Linking for secure authentication
  • Webhooks for order confirmation and post-purchase events
UCP Transaction APIs
Consulting & Go-Live

Strategy, testing and launch

Not sure where to start? I analyse your shop setup, define the integration scope, and guide you from the first endpoint to a fully tested, live UCP implementation – including documentation for your team.

  • Technical audit of your current shop system and API landscape
  • End-to-end testing with real AI agent flows before go-live
  • Handover documentation and ongoing availability for questions
UCP Beratung und Go-Live

For agencies: UCP as a service for your clients

You offer e-commerce consulting and need someone to build the UCP integration? I work as a freelancer in the background – no visible branding.

Learn more

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Why WebAufbau

What sets me apart as a UCP developer

Deep API & backend experience

UCP is backend work: REST APIs, authentication flows, webhooks and data pipelines. That's exactly what I've been doing for over 15 years across dozens of commerce projects.

Shop-system knowledge

I know Shopware, WooCommerce and custom PHP backends from the inside. I integrate UCP into your existing architecture – no full rewrite needed.

Direct and personal

No account managers, no ticket queues. You talk directly to the developer – by phone, email or video call – at every stage of the project.

The Process

Your UCP integration in 4 steps

1

Discovery Call

We look at your shop system, your current API setup and which UCP layers are most urgent. Short call by phone or video – no commitment.

2

Scope & Plan

I define which endpoints, manifest files and APIs need to be built, and provide a clear scope with effort estimate.

3

Development & Testing

I build the UCP endpoints, integrate them with your shop system and test the full flow with real AI agents before launch.

4

Go-Live & Handover

Deployment, final checks, documentation and handover. I remain available for questions and future extensions.

FAQ

Frequently asked questions about Google UCP

What is Google UCP?
Universal Commerce Protocol (UCP) is an open standard developed by Google that allows AI agents – such as Gemini, ChatGPT and others – to interact directly with online shops. Instead of a human going through a checkout page, an AI agent can browse products, add them to a cart and complete a purchase autonomously. UCP defines both a Discovery Layer (how the shop presents itself to AI) and a Transaction Layer (how purchases are executed).
Does my shop actually need UCP right now?
AI-driven commerce is still emerging, but the infrastructure is being put in place now. Early adopters gain a significant advantage: shops that are UCP-ready will appear in AI-generated shopping recommendations and agent-driven purchase flows before their competitors. If your audience uses AI assistants – and they increasingly do – now is the right time to prepare.
Does UCP work with Shopware and WooCommerce?
Yes, with custom development. Shopify has UCP built in, but Shopware, WooCommerce and custom backends require dedicated API endpoints and manifest files. That's exactly what I build: a UCP integration that sits on top of your existing shop system without requiring a platform migration.
What does the UCP integration cost?
The effort depends on your shop system, existing API coverage and which UCP layers you want to implement. I provide a tailored quote after a short discovery call – please get in touch and we can assess the scope together.
How long does the integration take?
A Discovery Layer implementation (manifest files, ai-catalog.json) is typically ready within one to two weeks. The full Transaction Layer – Cart API, Checkout, Payment Token and Webhooks – takes two to four weeks depending on your backend complexity. I'll give you a realistic estimate after reviewing your setup.
What is the difference between UCP and MCP?
MCP (Model Context Protocol) is a general-purpose standard for connecting AI assistants to any data source or tool – databases, CRMs, internal systems. UCP (Universal Commerce Protocol) is specifically designed for e-commerce: it defines how AI agents browse, cart and purchase in online shops. The two standards complement each other and can both be implemented alongside your existing infrastructure.

Ready to make your shop AI-ready?

Let's talk in a short call about which UCP layers make sense for your shop – and what the integration would involve.

+41 61 539 12 25 Send a message