Personal survey links, one per contact. Body { userIds?: string[], contactIds?: string[], csv?: string, expiresInDays?: number, format?: 'json'|'csv' } (≤ 5000). format: 'csv' answers text/csv
userId,email,name,url. Returns { links: [{ userId, email?, name?, url }], expiresAt, skipped };
url = help center domain + /s/<slug>?t=<token>.
Bearer <token>.Ok