Requests a tradable FX quote for a currency pair. The fixedSide indicates which amount is fixed: Buy fixes the amount of buyCurrency received, Sell fixes the amount of sellCurrency spent; the requested amount is in minor units. The returned buy and sell each carry amountInMinorUnits alongside the same figure as a decimal value, in their respective currency. When valueDate is omitted the earliest available value date for the pair is used. The quote is executable until expiresAt. Execute it with POST /fx/trades; a quote past expiresAt is rejected with 422. Requesting a quote carries no commitment.