Would you rather a higher base pay without many commission opportunities or a lower base pay with lots of commission opportunities? Why?
Your answer to this question will help show the interviewer how driven you are to sell. Although your primary job function as a fintech account manager will be to foster new client relationships and keep existing clients happy, there is also a large sales component. You will want to show that you are motivated to sell, which generally means that you're open to earning commissions and bonuses in addition to your base salary.
"While I'm open to most pay structures, the idea of earning commissions and/or bonuses based on my performance definitely appeals to me. It's always nice to have a base salary to fall back on, but the prospect of earning more money according to how much hard work I put in and how many times I can upsell and expand accounts motivates me. I enjoy the challenge of closing deals, in addition to helping cliens I care about resolve business problems."