curl --request POST \
  --url https://api.elections.kalshi.com/trade-api/v2/portfolio/orders/{order_id}/decrease \
  --header 'Content-Type: application/json' \
  --header 'KALSHI-ACCESS-KEY: <api-key>' \
  --header 'KALSHI-ACCESS-SIGNATURE: <api-key>' \
  --header 'KALSHI-ACCESS-TIMESTAMP: <api-key>' \
  --data '{
  "reduce_by": 2,
  "reduce_to": 1
}'

{
  "order": {
    "order_id": "<string>",
    "user_id": "<string>",
    "client_order_id": "<string>",
    "ticker": "<string>",
    "side": "yes",
    "action": "buy",
    "type": "limit",
    "status": "resting",
    "yes_price": 123,
    "no_price": 123,
    "yes_price_dollars": "0.5000",
    "no_price_dollars": "0.5000",
    "fill_count": 123,
    "remaining_count": 123,
    "initial_count": 123,
    "taker_fees": 123,
    "maker_fees": 123,
    "taker_fill_cost": 123,
    "maker_fill_cost": 123,
    "taker_fill_cost_dollars": "<string>",
    "maker_fill_cost_dollars": "<string>",
    "queue_position": 123,
    "taker_fees_dollars": "<string>",
    "maker_fees_dollars": "<string>",
    "expiration_time": "2023-11-07T05:31:56Z",
    "created_time": "2023-11-07T05:31:56Z",
    "last_update_time": "2023-11-07T05:31:56Z",
    "self_trade_prevention_type": "taker_at_cross",
    "order_group_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "cancel_order_on_pause": true
  }
}