curl --request GET \
  --url http://localhost:8080/v1/balances/{currency} \
  --header 'Authorization: Bearer <token>'

{
  "id": "<string>",
  "merchant_id": "<string>",
  "currency": "<string>",
  "available": "<string>",
  "pending": "<string>",
  "total": "<string>",
  "updated_at": "2023-11-07T05:31:56Z"
}