A fantasy world accountant

My problem is I have it locked in my head as A Taste of Gold and Iron which is NOT it.

An arranged marriage in a fantasy world. Mc1 is convinced it will bring financial ruin. Maybe one of them has money and the other is noble. I think mc1 is older and had a previous relationship with someone starting with J that ended badly. There is a lot of world building and economics. There is a pushy (evil?) older sister. For some reason the merchants were delayed and there’s embezzlement.

It may be a/b/o. The cover of the book is illustrated and pretty with a kind of picture frame around the edge. Part of a series.

— writing this I have convinced myself that I’m just wrong and confusing multiple books. If anyone can glean a title from this mess you’re a genius. Thank you!