curl --request POST \
  --url https://api-dev.narrative.io/admin/contracts \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "company_id": 123,
  "rates": [
    {
      "product_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "sku": "<string>",
      "end": "2023-11-07T05:31:56Z"
    }
  ],
  "start": "2023-11-07T05:31:56Z",
  "end": "2023-11-07T05:31:56Z",
  "internal_notes": "<string>",
  "revision_notes": "<string>"
}
'

{
  "createdContract": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "payable_company_id": 123,
    "payment_method": {},
    "revision": 123,
    "revision_start": "2023-11-07T05:31:56Z",
    "updated_by": 123,
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z",
    "internal_notes": "<string>",
    "revision_notes": "<string>",
    "revision_end": "2023-11-07T05:31:56Z"
  },
  "createdRates": [
    {
      "contract_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "contract_revision": 123,
      "product_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "rate": {
        "unit_price": {
          "value": 123,
          "expressed_in": "cents",
          "currency": "USD"
        }
      },
      "start_at": "2023-11-07T05:31:56Z",
      "end_at": "2023-11-07T05:31:56Z",
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z"
    }
  ]
}