Zoho Recruit API v2: insert (create) Candidate and Job Opening records

Steps

1. Complete Zoho OAuth2 and obtain an access token with a scope covering the target module, e.g. ZohoRECRUIT.modules.candidate.CREATE or ZohoRECRUIT.modules.ALL.
2. POST to https://recruit.zoho.com/recruit/v2/{module_api_name} (e.g. Candidates, Job_Openings) with header Authorization: Zoho-oauthtoken {token}.
3. Wrap the record(s) to insert in a top-level 'data' array, using only Field API names (not display labels) as keys, and send up to 100 records per call.
4. For lookup-type fields, pass a JSON object with the related record's id and name (e.g. Department_Name: {id, name}); for multi-select lookups, pass a JSON array of such objects.
5. Optionally set $state to 'draft' to save the record as a draft instead of a normal record, and set 'trigger' to [] if you want to suppress associated workflows/approvals/blueprints.
6. Check each entry in the response 'data' array for code SUCCESS/status success versus per-record error codes like MANDATORY_NOT_FOUND or INVALID_DATA.