curl --request GET \
  --url https://api.example.com/accounts/{accountId}/balances

{
  "id": "<string>",
  "accountID": "<string>",
  "at": "2023-11-07T05:31:56Z",
  "balances": [
    {
      "amount": "<string>",
      "currency": "<string>"
    }
  ]
}