curl --request POST \
  --url https://api.endclose.com/v1/bank_account_balances/bulk \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <api-key>' \
  --data '
{
  "bank_account_id": "<string>",
  "balances": [
    {
      "date": "2023-12-25",
      "amount_cents": 123
    }
  ]
}
'

{
  "count": 123,
  "balances": [
    {
      "bank_account_id": 123,
      "date": "2023-12-25",
      "amount_cents": 123,
      "id": 123,
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z"
    }
  ]
}