curl --request GET \
  --url https://api.smokeball.com/bankaccounts/{id}/matter-balances \
  --header 'Authorization: <api-key>' \
  --header 'x-api-key: <api-key>'

{
  "id": "<string>",
  "href": "<string>",
  "relation": "<string>",
  "method": "GET",
  "self": {
    "id": "<string>",
    "href": "<string>",
    "relation": "<string>",
    "method": "GET"
  },
  "value": [
    {
      "matter": {
        "id": "<string>",
        "href": "<string>",
        "relation": "<string>",
        "method": "GET"
      },
      "balance": 1000,
      "protectedBalance": 1000,
      "availableBalance": 1000,
      "unpresentedChequesBalance": 0,
      "lastUpdated": "2023-11-07T05:31:56Z"
    }
  ]
}