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- Add ExchangeRateService interface with GetExchangeRate, ConvertAmount, GetRateHistory, UpdateExchangeRate, GetSupportedCurrencies, ValidateCurrencyPair, and RefreshRates methods - Add CurrencyRevenue struct with currency and revenue fields - Add TransactionTypeStats struct with type, count, amount, and currency fields - Align struct field tags consistently across Currency, ExchangeRate, Transaction, and request/response types