UCP Identity Linking

What it does

This skill documents how to implement UCP Identity Linking using the OAuth 2.0 authorization code flow. It explains the architecture and practical steps for platforms and merchants to securely link buyer accounts so agents can access loyalty data, saved addresses, and personalized pricing during checkout. The skill covers discovery, required endpoints, token exchange, and recommended metadata publishing.

When to use it

Use this skill when building account linking or SSO integrations between a Platform and a Business under the UCP (Universal Commerce Platform) specification — for example when enabling agents to act on behalf of buyers, apply account-based discounts, or surface order history during checkout. It is relevant during integration design, API implementation, and security reviews.

What's included

• Scripts: none bundled; the SKILL.md points to authoritative spec pages and Google's UCP developer guide to ensure current OAuth requirements are followed.
• References: guidance to fetch live UCP spec pages and Google's UCP developer guide.
• Instructions: conceptual architecture, OAuth flows, required RFCs, scope declaration, capability discovery, and implementation guidance for both Platforms and Businesses.

Compatible agents

Useful for developer assistants and integration engineers using tools that support web lookups and API integration guidance (claude-code, codex, cursor, general developer agents).