Curious about the design behind authorize.net? SiteFontCheck scanned their live CSS architecture and identified 5 unique font families. The website relies heavily on <open-sans, open sans, sans-serif, tahoma> for its main text elements, paired with <relative-bold, sans-serif> and <relative-book, sans-serif> as fallback options, and 2 additional. Below is the precise map of font sizes, weights, and text elements used across their site.