curl --request POST \
  --url https://v1.api.flux-os.com/contracts/{id}/pricing-provisions \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --header 'x-user-id: <api-key>' \
  --data '
{
  "type": "<unknown>",
  "fee": "<unknown>",
  "description": null
}
'

{
  "data": {
    "id": "<string>",
    "type": {
      "name": "<string>",
      "short_code": "<string>",
      "id": "<string>"
    },
    "contract": {
      "external_id": "<string>",
      "id": "<string>"
    },
    "description": null,
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z",
    "fee": {
      "type": "<unknown>",
      "fee_category": "<unknown>",
      "currency": "<unknown>",
      "id": "<string>",
      "amount": null,
      "transport_leg": "<unknown>",
      "measurement_unit": "<unknown>",
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z"
    },
    "groups": [
      {
        "id": "<string>",
        "provision": {
          "type": "<unknown>",
          "contract": "<unknown>",
          "fee": "<unknown>",
          "id": "<string>",
          "description": null,
          "created_at": "2023-11-07T05:31:56Z",
          "updated_at": "2023-11-07T05:31:56Z"
        },
        "parent_group": "<unknown>",
        "logical_operator": {
          "name": "<string>",
          "symbol": "<string>",
          "id": "<string>"
        },
        "created_at": "2023-11-07T05:31:56Z",
        "updated_at": "2023-11-07T05:31:56Z",
        "conditions": [
          {
            "value": 123,
            "id": "<string>",
            "measurement_property": {
              "name": "<string>",
              "short_code": "<string>",
              "id": "<string>"
            },
            "measurement_unit": {
              "name": "<string>",
              "abbreviation": "<string>",
              "id": "<string>",
              "html_symbol": null
            },
            "comparison_operator": {
              "name": "<string>",
              "symbol": "<string>",
              "id": "<string>"
            },
            "created_at": "2023-11-07T05:31:56Z",
            "updated_at": "2023-11-07T05:31:56Z"
          }
        ]
      }
    ]
  }
}