module BtcpayManager
  class FetchExchangeRate < BtcpayManagerService
    def initialize(fiat_currency:)
      @fiat_currency = fiat_currency
    end

    def call
      pair_str = "BTC_#{@fiat_currency}"
      res = get "rates", { currencyPair: pair_str }
      pair = res.find{|p| p["currencyPair"] == pair_str }
      rate = pair["rate"].to_f
    end
  end
end