curl --request GET \
  --url https://api.example.com/v1/balance \
  --header 'x-access-id: <api-key>'

{
  "account": {
    "amount_in_cents": 123,
    "currency": "<string>",
    "id": "<string>",
    "updated": "2023-11-07T05:31:56Z"
  }
}