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Universal Commerce Protocol (UCP) Samples

This directory contains sample implementations and client scripts for the Universal Commerce Protocol (UCP).

Sample Implementations

Python

A reference implementation of a UCP Merchant Server using Python and FastAPI.

  • Server: Documentation

    • Located in rest/python/server/.
    • Demonstrates capability discovery, checkout session management, payment processing, and order lifecycle.
    • Includes simulation endpoints for testing.

  • Client: Happy Path Script

    • Located in rest/python/client/.
    • A script demonstrating a full "happy path" user journey (discovery -> checkout -> payment).

Node.js

A reference implementation of a UCP Merchant Server using Node.js, Hono, and Zod.

  • Server: Documentation
    • Located in rest/nodejs/.
    • Demonstrates implementation of UCP specifications for shopping, checkout, and order management using a Node.js stack.

A2A (Agent-to-Agent)

An AI-powered retail agent implementing UCP via the A2A protocol.

  • Cymbal Retail Agent: Documentation
    • Located in a2a/business_agent/.
    • Demonstrates A2A protocol integration with UCP Extension.
    • Includes AI-powered shopping assistant with Google ADK and Gemini.
    • React-based chat client for user interaction.

Getting Started

Please refer to the specific README files linked above for detailed instructions on how to set up, run, and test each sample.