post
https://company_subdomain.talkpush.com/api/talkpush_services/company/candidate_attributes
Creates a new custom attribute definition. It becomes available in the UI immediately and is writable on leads through the others field using the persisted key (custom keys are stored with an others. prefix where applicable).
Duplicate prevention: If the normalized key already exists for an attribute, the API returns 409 Conflict (not a second record).
Required fields: name and key (see request schema). data_type defaults to text when omitted.