curl --request GET \
  --url https://drb.coinbase.com/api/v2/private/get_order_state \
  --header 'Content-Type: application/json' \
  --data '
{
  "id": 4316,
  "jsonrpc": "2.0",
  "method": "private/get_order_state",
  "params": {
    "order_id": "ETH-331562"
  }
}
'

{
  "id": 4316,
  "jsonrpc": "2.0",
  "result": {
    "amount": 37,
    "api": false,
    "average_price": 118.94,
    "creation_timestamp": 1550219749176,
    "direction": "sell",
    "filled_amount": 37,
    "instrument_name": "ETH-PERPETUAL",
    "is_liquidation": false,
    "is_rebalance": false,
    "label": "",
    "last_update_timestamp": 1550219810944,
    "max_show": 37,
    "order_id": "ETH-331562",
    "order_state": "filled",
    "order_type": "limit",
    "post_only": false,
    "price": 118.94,
    "reduce_only": false,
    "time_in_force": "good_til_cancelled"
  }
}