{"amounts":"integer cents","attestation_signature":"ES256 raw r||s base64url over canonical JSON of the attestation without the 'signature' field","categories":["alcohol","electronics","groceries","household","tobacco"],"display_name":"Demo-Supermarkt","documentation":"https://docs.s-you.me/api/merchant-service","endpoints":{"attest":"/attest","catalog":"/catalog","dashboard":"/dashboard","events":"/events","item":"/catalog/{item_id}"},"merchant_id":"merchant_schwarz_demo","openapi":"/openapi.yaml","rejection_codes":["unknown_merchant","unknown_item","empty_basket","category_not_allowed","category_excluded","age_restricted_not_allowed","agent_not_verified"],"service":"merchant-service","signing_key":{"alg":"ES256","crv":"P-256","kid":"merchant-demo-1","kty":"EC","use":"sig","x":"9Aj2Bdqax6b1l9AWbhZ1In-LRppDCIeQMKKE9-4BwoA","y":"_T3zUuOYA_X8HVUl_v7eJnL0bzUQjgFBxV0Ynx0e3Bg"},"version":"2026-10-10"}