const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    tenant_id: '01935-tttt-tttt-tttt-tttttttttttt',
    goal: 'purchase',
    conversation_id: '01935-aaaa-bbbb-cccc-dddddddddddd',
    external_ref: 'order-4567',
    occurred_at: '2026-05-28T10:00:00Z',
    props: {value: 129, currency: 'USD'}
  })
};

fetch('{protocol}://{host}/api/v1/insights/conversions', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "deduped": true,
  "completion_id": "01935-cccc-…"
}