Ask HN: do you use specific artwork or fonts on payment pages

Hi, I'm creating a browser based game, and I'm trying to find some research on this, but failed to find anything. Is the conversion better when the payment page uses the same style and fonts as the rest of the game, or is it better to use regular fonts provided by browser? My game has a fantasy setting, so fonts are somewhat hard to read at the first glance because it's stylish (main font is Storybook Thin). I see that Zynga is using some regular Sans fonts in some of their games - only on payment page. I know I should not look up to Zynga and do as they do, but I assume they went crazy with A/B testing and probably found the best performing combination. I can't believe they were simply lazy to draw better graphics. Has anyone got any experience on this or knows about some published article/research on the topic? Thanks.