# London Stock Exchange Group (LSEG)

> LSEG is a United Kingdom-based stock exchange and financial information company. Its API surface catalogued here centers on the World-Check One API - screening for KYC, sanctions, PEP, and anti-money-laundering due diligence - alongside the wider LSEG Data Platform SDK ecosystem. World-Check One API v2 is served from https://api-worldcheck.refinitiv.com/v2 (HMAC request signing); API v3 is served from https://api.risk.lseg.com/screening/v3/ (OAuth 2.0 service accounts recommended, HMAC supported).

Generated by API Evangelist from the london-stock-exchange-group repository catalog (no provider-published llms.txt was found; developers.lseg.com/llms.txt returns an HTML SPA shell).

## APIs

- [World-Check One API](https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api): Screening cases, results, ongoing screening, MediaCheck adverse media, reports, groups, users, and reference data
- [World-Check One Quick Start](https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api/quick-start): Credentials (OAuth 2.0 service accounts or HMAC key/secret), pilot vs production, Postman collection
- [LSEG API Catalog](https://developers.lseg.com/en/api-catalog): Full catalog of LSEG APIs (Data Platform, Real-Time, Tick History, DataScope Select, screening)

## Specs

- [Case API OpenAPI](https://raw.githubusercontent.com/api-evangelist/london-stock-exchange-group/refs/heads/main/openapi/london-stock-exchange-group-case-api-openapi.yml): Create, screen, update, archive, assign, and search screening cases; review and resolve results; ongoing screening
- [Media-Check API OpenAPI](https://raw.githubusercontent.com/api-evangelist/london-stock-exchange-group/refs/heads/main/openapi/london-stock-exchange-group-media-check-api-openapi.yml): Adverse media results, article metadata/content, attach/detach, smart filter
- [Reference API OpenAPI](https://raw.githubusercontent.com/api-evangelist/london-stock-exchange-group/refs/heads/main/openapi/london-stock-exchange-group-reference-api-openapi.yml): Countries, nationalities, providers, profiles, records, PEP details
- [Group API OpenAPI](https://raw.githubusercontent.com/api-evangelist/london-stock-exchange-group/refs/heads/main/openapi/london-stock-exchange-group-group-api-openapi.yml): Groups, case templates, resolution toolkits
- [Reporting API OpenAPI](https://raw.githubusercontent.com/api-evangelist/london-stock-exchange-group/refs/heads/main/openapi/london-stock-exchange-group-reporting-api-openapi.yml): Async report submission, status, download
- [Audit API OpenAPI](https://raw.githubusercontent.com/api-evangelist/london-stock-exchange-group/refs/heads/main/openapi/london-stock-exchange-group-audit-api-openapi.yml): Case audit events
- [All specs](https://github.com/api-evangelist/london-stock-exchange-group/tree/main/openapi): Fifteen per-domain OpenAPI documents split from the World-Check One API v2.61 Swagger 2.0 definition

## Docs

- [Authentication](https://developers.lseg.com/en/api-catalog/customer-and-third-party-screening/world-check-one-api/quick-start): OAuth 2.0 service-account credentials (v3, recommended) or per-user API key + HMAC-SHA256 request signatures (Authorization: Signature keyId=... headers="(request-target) host date content-type content-length")
- [Developer Community](https://community.developers.lseg.com/): Q&A forum for World-Check One and all LSEG APIs
- [Support](https://support.lseg.com/): LSEG customer support
- [System status](https://liveservice.lseg.com/): LSEG live system status
- [Client libraries](https://github.com/api-evangelist/london-stock-exchange-group/blob/main/packages/london-stock-exchange-group-packages.yml): lseg-data (PyPI), LSEG.Data (NuGet), com.refinitiv.ema (Maven), @refinitiv-ui (npm)