generated: '2026-06-20'
method: derived
source: openapi/_original/lseg-world-check-one-openapi-original.yml + developers.lseg.com quick start
description: >-
  Cross-cutting request/response semantics of the LSEG World-Check One API.
authentication:
  style: HMAC-SHA256 signed requests (v2) or OAuth 2.0 service accounts (v3)
  headers: [Authorization, Date]
  detail: authentication/london-stock-exchange-group-authentication.yml
idempotency:
  supported: false
  notes: No Idempotency-Key header or documented idempotency contract; bulk endpoints are not idempotent
pagination:
  styles:
    - style: request-body pagination object
      params: [pagination.itemsPerPage, pagination.currentPage, pagination.pageReference, sort]
      used_by: case search, MediaCheck results, audit events
      notes: Search-style POST endpoints take a pagination object in the request body and echo it in responses
    - style: cursor scroll
      endpoints: [POST /cases/summaries, POST /cases/summaries/cursor]
      notes: >-
        Initial request returns a cursor-id; subsequent scrolling uses the
        cursor endpoint. Cursor lifespan is 60 seconds, extended on each
        access; expired cursors return 410 Gone.
filtering:
  language: FIQL
  notes: Case search and audit-event filters accept FIQL comparison expressions with AND/OR boolean operators
request_tracing:
  request_id_header: null
  notes: No documented request-id/correlation header
versioning:
  scheme: uri-path (v1/v2/v3)
  detail: lifecycle/london-stock-exchange-group-lifecycle.yml
error_envelope:
  schema: Error (error, cause, objectId)
  detail: errors/london-stock-exchange-group-problem-types.yml
rate_limiting:
  signaling: HTTP 429 declared on every operation
  headers: []
  notes: No documented rate-limit response headers or Retry-After; see rate-limits/london-stock-exchange-group-rate-limits.yml
content_types:
  request: application/json (415 returned otherwise)
  response: application/json
date_header:
  required: true
  format: RFC 1123
  purpose: Replay protection - requests are only valid at the point in time of their Date header