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Notes:

Although fiatAmount and cryptoAmount are both not required together, you need to pass at least one of them in all isBuyOrSell: "BUY" cases. Our recommendation would be to pass fiatAmount in such cases. If both fiatAmount and cryptoAmount are passed in case of isBuyOrSell: "BUY" then cryptoAmount would take precedence

In case of isBuyOrSell: "SELL", cryptoAmount is a required param. If fiatAmount is passed in such cases, then it will be ignored

quoteCountryCode is an optional param which should be passed in case you want to ensure consistency in pricing that user sees on your platform as well as ours. In case an invalid ISO 3166 Alpha-2 country code is passed then this param will not be honored. Please refer to this page for detailed information about the usage of quoteCountryCode.