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Example code of tcgunel/ucp-laravel

Informations about the package ucp-laravel

UCP for Laravel

Expose any Laravel storefront to AI shopping agents through Google's Universal Commerce Protocol (UCP).

Tests PHP Laravel

The Universal Commerce Protocol is the open standard — announced by Google in January 2026 and developed with Shopify, Etsy, Wayfair, Target and Walmart — that lets AI agents (Google AI Mode, Gemini, and others) discover and buy from a store programmatically.

ucp-laravel makes your application UCP-native. You implement small per-capability contracts that map your products and orders onto the UCP schema; the package serves the discovery manifest, the capability endpoints, validation, and the response envelopes.

Capabilities

The package implements the full UCP 2026-04-08 shopping capability surface over the REST binding:

Capability UCP identifier Status
Discovery manifest /.well-known/ucp ✅
Catalog — search / lookup / detail dev.ucp.shopping.catalog ✅
Cart dev.ucp.shopping.cart ✅
Checkout dev.ucp.shopping.checkout ✅
Discount dev.ucp.shopping.discount ✅
Fulfillment dev.ucp.shopping.fulfillment ✅
Order — lookup + webhooks dev.ucp.shopping.order ✅
Identity Linking — OAuth 2.0 dev.ucp.common.identity_linking ✅
AP2 Mandates — agent payments dev.ucp.shopping.ap2_mandate ✅

Security-critical pieces stay in your application, behind contracts: the package never captures payment, never implements an OAuth server, and never owns your signing keys. Checkout completion, the OAuth /oauth2/* endpoints and the ES256 crypto are delegated to provider contracts you implement.

Spec note. UCP is young and its schemas are still moving. This package mirrors the 2026-04-08 revision; treat the JSON shapes as a faithful implementation, not a frozen guarantee. Verify against ucp.dev before going to production.

Requirements

Installation

Once published to Packagist:

While the package is consumed privately across projects, add it as a path or VCS repository — see docs/installation.md.

Publish the config file (optional — the package works with sensible defaults):

The service provider is auto-discovered. The UCP routes are live immediately; each capability stays dormant — and unadvertised in the manifest — until you configure its provider.

Quick start

Each capability is one contract. Start with Catalog — it is read-only and the fastest to ship:

Register it:

Every other capability follows the same shape — implement a contract, register it under its config key. See the guides below.

Endpoints

Method & path Capability
GET /.well-known/ucp discovery manifest
GET /.well-known/oauth-authorization-server · /.well-known/oauth-protected-resource Identity Linking
POST /catalog/search · /catalog/lookup · /catalog/product Catalog
POST /carts · GET·PUT /carts/{id} · POST /carts/{id}/cancel Cart
POST /checkout-sessions · GET·PUT /checkout-sessions/{id} · POST …/complete · …/cancel Checkout
GET /orders/{id} Order

Catalog requests reject malformed input with 422. For cart, checkout and order, business outcomes return 200 with a messages[] array — the UCP convention — while only protocol-level problems use HTTP error statuses. Order-lifecycle updates are pushed to agents as signed webhooks.

How it works

The package owns the protocol — routing, the manifest, request validation, the ucp response envelope, the JSON schema. Your application owns the data, the OAuth server and the crypto, through small contracts. Controllers stay thin; DTOs are immutable; every capability is an interface.

Documentation

Guide Contents
Installation Composer setup, publishing, what gets registered
Configuration Every config/ucp.php key
Catalog provider The catalog contract, the DTOs, money precision
Cart & checkout providers The session contracts, lifecycle, discounts, fulfilment, payment
Order, Identity & AP2 Order webhooks, OAuth discovery, AP2 mandates
Multi-tenancy Per-tenant manifests and capabilities
Manifest reference The /.well-known/ucp JSON structure
Roadmap What's next

Multi-tenancy

The package is built for multi-tenant SaaS. Endpoint URLs in the manifest follow the request host, so per-tenant domains work with zero extra wiring. See docs/multi-tenancy.md.

Testing

The suite runs against Orchestra Testbench; no host application is required.

Code quality

Tool Command Standard
Pint composer lint / composer format Laravel preset + strict types
PHPStan (Larastan) composer analyse Level 8
PHPUnit composer test —

composer check runs all three.

Contributing

Bug reports and pull requests are welcome. Please run composer check before opening a PR. See CHANGELOG.md for release history.

License

The MIT License. See LICENSE.

Credits

All versions of ucp-laravel with dependencies

PHP Build Version
Package Version
Requires php Version ^8.2
illuminate/contracts Version ^11.0 || ^12.0 || ^13.0
illuminate/http Version ^11.0 || ^12.0 || ^13.0
illuminate/routing Version ^11.0 || ^12.0 || ^13.0
illuminate/support Version ^11.0 || ^12.0 || ^13.0
Composer command for our command line client (download client) This client runs in each environment. You don't need a specific PHP version etc. The first 20 API calls are free. Standard composer command

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