It’s simple to use, simply ad
?google_force_console to a URL that’s using DFP and Google will automatically load a nice inspector to see what data is being used to generate the ads on a site.
Rather than having to manually add this query argument to a page, I went ahead and wrote a quick WordPress plugin to do it for me. The plugin is simple: after you install it and activate it, a “Google Ad Console” button will be added to the WordPress Admin Bar when you’re logged into your site (the link only appears on the front-end of your site, as you’re probably not running ads in wp-admin). Click it once, and the current page is reloaded with
?google_force_console in the URL. Click it again, and it’s gone.