code: public CoinbasePrice getCoinbaseBuyPrice(BigDecimal quantity, String currency)
        throws IOException {
  
      return coinbase.getBuyPrice(quantity, currency);
    }
docs: Unauthenticated resource that tells you the total price to buy some quantity of Bitcoin.
  
  @param quantity The quantity of Bitcoin you would like to buy (default is 1 if null).
  @param currency Default is USD. Right now this is the only value allowed.
  @return The price in the desired {@code currency} to buy the given {@code quantity} BTC.
  @throws IOException
  @see <a
  href="https://coinbase.com/api/doc/1.0/prices/buy.html">coinbase.com/api/doc/1.0/prices/buy.html</a>