curl --request GET \
  --url https://crypto.westminister.tech/api/v1/auth/fiat-currencies \
  --header 'Authorization: Bearer <token>'

{
  "fiat_currencies": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "iso_code": "<string>",
      "display_name": "<string>",
      "fraction_digits": 123,
      "sort_order": 123
    }
  ]
}