{"ucp":{"version":"2026-01-23","services":{"dev.ucp.shopping.checkout":[{"version":"2026-01-23","transport":"REST","endpoint":"https://aztrix.io/api/ucp/checkout/checkout-sessions","method":"POST","operation":"create_session","authentication":{"schemes":[{"type":"http-header","name":"X-API-Key","required":true,"description":"Aztrix-issued per-merchant key. Each UCP-enabled merchant has one signing key issued by Aztrix; obtain it from the merchant directly or via Aztrix support. Programmatic key minting is a planned API."}],"required_headers":[{"name":"X-API-Key","description":"Aztrix-issued agent key (see schemes above)."},{"name":"X-Merchant-Id","description":"Listing UUID for the merchant. Use the value from x-aztrix.merchant.id in this manifest. Also accepted as ?merchant_id= query param."},{"name":"Request-Id","format":"uuid-v4","description":"Per-request correlation + idempotency tag. Must be unique unless deliberately retrying."},{"name":"Content-Type","value":"application/json"}],"optional_headers":[{"name":"Idempotency-Key","description":"Reuse the same value to safely retry a POST without creating duplicate sessions."},{"name":"UCP-Agent","format":"product/version; profile=\"<url>\"","description":"Identifies the calling agent. 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