How does Capital One Shopping handle sales tax calculations in its price comparisons?12. What customer support options are available for Capital One Shopping users?Unleash Savings on Amazon: A Masterclass on Capital One ShoppingCapital One Shopping can be your secret weapon for scoring deals on Amazon, but navigating its features requires a bit of know-how. The core functionality revolves around automatic price comparison, coupon discovery, and rewards earning. Touse Capital One Shopping on Amazon, you simply need to install the Capital One Shopping browser extension. Once installed, it automatically activates as you browse Amazon, comparing prices across different sellers and even searching for applicable coupon codes that you might otherwise miss.