Although not required for launch, the pixel is highly recommended so that you have easy access to sales and ROI-related metrics such as revenue, conversion rate, cost per order, and return on ad spend (ROAS). This data is available for download in the Promoted Products Report (access to the report is granted upon launch). Please see our Conversion Pixel Implementation Guide for more information. You do not need to implement a separate mobile-specific pixel if your website is responsive. If your website is not responsive, simply follow the conversion pixel guide for implementation on your mobile confirmation page. Please note that we are unable to provide any campaign optimization support without the pixel.