(Conditionally required)
Specify the currency pair for the quote.
Either currencyPair or both currencyOne and currencyTwo are required.
If not specified, then the currency pair will be derived from currencyOne and currencyTwo
Example: You can specify either EURUSD or USDEUR to get the exchange rate in your desired convention.
If you do not provide a currency pair, the exchange rate will be provided in default convention.