UCP Checkout REST Binding

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Implements Universal Commerce Protocol (UCP) checkout sessions via RESTful API bindings with support for idempotency, state transitions, and error resolution.

The ucp-checkout-rest skill enables Claude to manage or implement UCP-compliant checkout workflows over REST, facilitating seamless interaction between commerce platforms and agents. It provides a structured framework for handling the entire checkout lifecycle—from session creation and negotiation to payment completion and cancellation—while strictly adhering to UCP specifications for headers, data types, and status state machines. This skill is essential for developers building agentic commerce solutions or integrating merchant backends with the UCP ecosystem, ensuring robust handling of monetary values in minor units and secure, idempotent transactions.

Key Features

01Automated UCP version negotiation and capability pruning
02Support for minor currency unit calculations to prevent floating-point errors
03Standardized error handling based on UCP message severity enums
0432 GitHub stars
05Full lifecycle management for Create, Get, Update, Complete, and Cancel operations
06Strict idempotency support using UUID keys for all mutating requests

Use Cases

01Developing an AI agent capable of navigating and completing checkouts for users
02Building a UCP-compliant REST API for a merchant backend or headless store
03Implementing standardized commerce state machines for distributed checkout sessions