Welcome!
I see you posted in two threads and it seems both relate to the same overall task which appears to be:
“Can I link the company / officers data directly (via some kind of ID) to the disqualified directors data?”
… so I’ll just answer both your posts here:
As far as I’m aware nothing has changed since my posts (except the links to the documentation, which I’ll re-link below). So if you are trying to do the same things as the original posters then the same answers still apply:
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The answer to the question “In the REST API is there a way to find out an officer’s disqualifications based on his/her id which I used to get his/her appointments?” or “is there a unique identifier linking between disqualifications and officers / PCs / appointments” will be “no”. You can only search for disqualifications - essentially by name. You then request further info using the link you get from the Search resource (as described above).
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If you look at the other post you’ll see I mention it may be possible using the XML Gateway service. That service has its own forum too. Note that: (a) this is a paid-for service (b) we no longer use it so I’m not current and © this was never something we actually did ourselves.
A final note - I’m not a member of Companies House so my answers aren’t definitive - check this for yourself!