This post is also available in: 日本語 目次 1 Introduction1.1 Warning Banners Appear on Google Adsense Admin Screen1.2 What is ads.txt anyway?1.3 Check the trouble shooter2 What does your site need to do?3 Support for the Google Cloud Platform (GCP)3.1 Open Google Cloud Platform（GCP）3.2 Finally, confirm the installation. Introduction Warning Banners Appear on Google Adsense Admin Screen Since the beginning of 2019, the following warning banner has appeared on Google Adsense. Attention Required – Some sites do not contain an ads.txt file. Fix this problem now to avoid a significant revenue impact. What is ads.txt anyway? Google explains on their site:.   Quote: The declaration of a Certified Digital Seller (Authorized Digital Sellers) by ads.txt is an initiative by the IAB to ensure that digital advertising inventory in content is only sold through authorized sellers (AdSense, etc.) by the publisher (If it’s a website, it’s a website operator.) of that content. By creating ads.txt on your own, you control strictly the sellers of your site’s inventory and prevent false inventory from being provided to advertisers.It is strongly recommended that you use ads.txt. The advantage of using ads.txt is that the buyer can determine the fake inventory, so the site operator … Continue reading How to respond to ads.txt warnings in Google Adsense with WordPress built on Google Cloud Platform.