generated: '2026-07-20'
method: searched
source: https://www.playpiper.in/.well-known/ucp, https://www.playpiper.in/.well-known/openid-configuration
notes: >-
  Cross-cutting standards the Piper storefront (Shopify store 9256256) conforms to,
  evidenced by its published discovery documents. These are platform-provided
  (Shopify) but served on Piper's domain.
standards:
- id: openid-connect
  conforms: true
  evidence: /.well-known/openid-configuration published (Shopify Customer Account OIDC)
- id: oauth2
  conforms: true
  evidence: /.well-known/oauth-authorization-server published; authorization_code + refresh_token grants
- id: oauth2-pkce
  conforms: true
  evidence: code_challenge_methods_supported includes S256
- id: rfc8414-oauth-authorization-server-metadata
  conforms: true
  evidence: /.well-known/oauth-authorization-server returns 200 with issuer/token/authorization endpoints
- id: ucp-universal-commerce-protocol
  conforms: true
  evidence: /.well-known/ucp merchant profile advertises UCP 2026-04-08 and 2026-01-23
- id: mcp-model-context-protocol
  conforms: true
  evidence: dev.ucp.shopping service exposes an MCP transport endpoint at /api/ucp/mcp
- id: fhir-r4
  conforms: false
- id: fapi
  conforms: false