UCP Embedded Checkout Implementation
Implements the Universal Commerce Protocol (UCP) Embedded Checkout for human escalation via JSON-RPC 2.0.
This skill provides specialized guidance for implementing the UCP Embedded Checkout Protocol, a standardized framework for iframe and webview-based checkout interfaces. It enables Claude to assist developers in building secure communication bridges between merchant-hosted UIs and host platforms using JSON-RPC 2.0 over postMessage. This is particularly useful for agentic commerce applications that encounter the 'requires_escalation' status, requiring a human buyer to interact with a merchant's UI to resolve issues, update line items, or provide payment credentials securely within a sandboxed environment.
Key Features
01Manages checkout lifecycle methods including ec.ready, ec.start, and ec.complete
0232 GitHub stars
03Integrates W3C DOMException error handling for robust protocol compliance
04Implements JSON-RPC 2.0 communication over postMessage
05Provides security guidance for CSP frame-ancestors and iframe sandboxing
06Handles delegated capabilities for payment credentials and fulfillment addresses
Use Cases
01Automating the transition from AI-led agents to human-led UIs during complex checkout flows
02Building merchant-side checkout pages that integrate with AI-driven commerce platforms
03Developing host platform handlers to frame and communicate with third-party checkouts