Solved
Cookie CID -> How to retrieve a profile?
Is the kx filter available on the getProfiles API endpoint the same as the cid one can extract from kla__id cookie after decoding the base64 into a json object?
https://a.klaviyo.com/api/profiles?filter=equals(_kx,’<exchange id>’)
This endpoint will return the user's 'person_id' in Klaviyo.
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