curl --request GET \
  --url {schemes}://api.upsun.com/discounts/types/allowance \
  --header 'Authorization: Bearer <token>'

{
  "currencies": {
    "EUR": {
      "formatted": "<string>",
      "amount": 123,
      "currency": "<string>",
      "currency_symbol": "<string>"
    },
    "USD": {
      "formatted": "<string>",
      "amount": 123,
      "currency": "<string>",
      "currency_symbol": "<string>"
    },
    "GBP": {
      "formatted": "<string>",
      "amount": 123,
      "currency": "<string>",
      "currency_symbol": "<string>"
    },
    "AUD": {
      "formatted": "<string>",
      "amount": 123,
      "currency": "<string>",
      "currency_symbol": "<string>"
    },
    "CAD": {
      "formatted": "<string>",
      "amount": 123,
      "currency": "<string>",
      "currency_symbol": "<string>"
    }
  }
}