generated: '2026-08-26'
method: probed
source: >-
  https://drinkprime.com/.well-known/openid-configuration (200),
  https://drinkprime.com/.well-known/oauth-authorization-server (200),
  https://drinkprime.com/.well-known/oauth-protected-resource (200), and an anonymous
  tools/list against https://drinkprime.com/api/ucp/mcp (200) - probed 2026-08-26.
note: >-
  Derived from probed metadata, not from an OpenAPI - Prime Hydration publishes no OpenAPI, so
  derive-authentication.py had nothing to read. Two distinct auth postures coexist on this
  provider.
schemes:
- id: none
  type: none
  applies_to: https://drinkprime.com/api/ucp/mcp
  description: >-
    The UCP shopping MCP endpoint answers tools/list anonymously - no Authorization header, no
    API key, no OAuth challenge. Catalog search/lookup, cart and checkout construction are all
    reachable without credentials.
  evidence: >-
    POST /api/ucp/mcp with no Authorization header returned HTTP 200 and the full 13-tool
    manifest with inputSchemas.
  identity_substitute: >-
    Instead of a credential, every tool requires meta.ucp-agent.profile - a URI identifying the
    calling agent. This is agent attestation/discovery, not authentication: it is unverified
    caller-asserted metadata and grants no privilege.
- id: buyer_approval
  type: out-of-band
  applies_to: complete_checkout
  description: >-
    Payment is authorized by the human buyer, not by the agent. complete_checkout additionally
    requires meta.idempotency-key. Buyer approval is a hard published requirement, restated in
    both robots.txt and llms.txt.
  evidence: https://drinkprime.com/robots.txt, https://drinkprime.com/llms.txt
- id: shopify_customer_accounts
  type: openIdConnect
  applies_to: https://drinkprime.com (customer account resources)
  description: >-
    Shopify Customer Accounts OAuth 2.0 / OpenID Connect, for a shopper acting on their own
    account. Authorization code flow with PKCE.
  issuer: https://shopify.com/authentication/60993569009
  authorization_endpoint: https://orders.drinkprime.com/authentication/oauth/authorize
  token_endpoint: https://orders.drinkprime.com/authentication/oauth/token
  end_session_endpoint: https://orders.drinkprime.com/authentication/logout
  jwks_uri: https://orders.drinkprime.com/authentication/.well-known/jwks.json
  grant_types_supported:
  - authorization_code
  - refresh_token
  - urn:ietf:params:oauth:grant-type:jwt-bearer
  response_types_supported: [code]
  code_challenge_methods_supported: [S256]
  token_endpoint_auth_methods_supported: [client_secret_basic, client_secret_post]
  id_token_signing_alg_values_supported: [RS256]
  subject_types_supported: [public]
  claims_supported: [iss, sub, aud, exp, iat, nonce, sid, email, email_verified]
  scopes: See scopes/prime-hydration-scopes.yml
  bearer_methods_supported: [header]
  protected_resource: https://drinkprime.com
registration:
  self_service: false
  note: >-
    There is no developer signup, API key issuance, or client registration surface. The MCP
    endpoint needs no registration; the Customer Accounts client is a Shopify-issued client for
    the storefront, not something a third party can provision here.