> For the complete documentation index, see [llms.txt](https://support.iafcertsearch.org/api-developer-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.iafcertsearch.org/api-developer-guide/data-handling/matching-existing-data.md).

# Matching existing data

Generally speaking existing data is matched (based on unique identifiers) and the systems extends/overrides it with the latest provided information.