curl -sS -X POST https://app.opentrain.ai/api/public/v1/contracts/<CONTRACT_ID>/milestones \
  -H "Authorization: Bearer $OT_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "Second labeling batch",
    "description": "Label the next 5,000 posts per the updated guidelines",
    "amountUsd": 300,
    "dueDate": "2026-07-15"
  }'

opentrain milestones create --contract-id <CONTRACT_ID> \
  --description "Label the next 5,000 posts per the updated guidelines" \
  --name "Second labeling batch" --amount 300 --due-date 2026-07-15 --json

{
  "contractId": "<CONTRACT_ID>",
  "name": "Second labeling batch",
  "description": "Label the next 5,000 posts per the updated guidelines",
  "amountUsd": 300,
  "dueDate": "2026-07-15"
}

{
  "milestone": {
    "id": "<MILESTONE_ID>",
    "name": "Second labeling batch",
    "description": "Label the next 5,000 posts per the updated guidelines",
    "status": "NOT_FUNDED",
    "amountUsd": 300,
    "volume": null,
    "milestoneNumber": 2,
    "dueDate": "2026-07-15T00:00:00.000Z",
    "pendingApproval": false,
    "needsReview": false,
    "invoiceId": null,
    "createdAt": "2026-06-12T10:00:00.000Z"
  }
}

{
  "error": "Contract has ended",
  "code": "CONFLICT",
  "requestId": "<REQUEST_ID>",
  "details": {
    "contractId": "<CONTRACT_ID>",
    "reason": "contract_ended"
  }
}