OCHA (Office for the Coordination of Humanitarian Affairs) is the part of the United Nations Secretariat responsible for bringing together humanitarian actors to ensure a coherent response to emergencies.
OCHA assigns it's own organisation identifiers to parties involved in funding or delivery of humanitarian work, which are used in UN OCHA data, and may be used by some third-parties.
Previously OCHA used identifiers from its Financial Tracking System (FTS) list. It has now changed and uses identifiers from its Humanitarian Programme Cycle (HPC) list.
Organisations may have different identifiers on the two lists. For example, if an organisation has a legacy code of XM-OCHA-FTS3524 then it does NOT automatically have a new code of XM-OCHA-HPC3524.The deprecated list may be found at http://fts.unocha.org/api/v1/organization.xml although this should only be used for checking historic data and there is no guarantee that it will remain accessible in the future.