post
https://api.sandbox.ibanq.com/v1/fx/trades
Executes a quote, booking the trade at the quoted rate and settling through the given account. The quote must still be Active; an expired or already-executed quote returns 422. Returns the created trade's id; fetch details via GET /fx/trades/{id}. Retries with the same internalReference return the original trade's id instead of booking a duplicate.