With this DevTools extension, you can simulate ComerciaJS's payment events, see the mocked payment state and test different config conditions. Please, note it will only work with ComerciaJSPolyfill library. Once installed, you'll see the extension's icon on the browser's toolbar. It will indicate if it has found ComerciaJSPolyfill code. If ComerciaJSPolyfill code is not detected, it will be gray. If it is detected, extension's icon will be colourful, and ComerciaJS tab will be on browser's DevTools panel. Press F12 and there it will be!