In Google Adwords, conversion tracking can be done in following ways
☛ Tracking purchases by involving basic tracking code provided by Adwords and modifying it with additional code unique to your particular e-commerce platform
☛ View-through conversion window options tracks when a person sees your ad but does not click it (impression)
☛ By enabling your ad rotation setting to optimize for clicks, meaning that Adwords will serve the ads it feels are likely to be clicked
☛ By accessing search funnels inside tools and analysis, you can also know when customers clicked on your ad for the first time and how frequently they saw your ad before converting.