I received a mail today titled AdMob starts implementing support for app-ads.txt files
Ensure that the app - ads.txt file is exe
AdMob App-Ads.txt without Domain
There is no need to buy a domain name. If you don’t have a website, you can follow these steps.
Ad Network Company has lunched app-ads.txt to prevent Ad Frauds and Here I Explain to you How to use app-ads.txt in Ad Network?
First of all, buy new domain relevant to your applications and add this domain(website) to your application store listing page now generate an app-ads.txt file from your Admob account
Google will automatically crawl this file within 24 hours
I know this question since long time ago, but after a lot of searching and focusing I found the answer
For ease you can check the picture below :
Click Save changed and you're done!
Source
You don't forgive this redirect:
This is in 'Custom Redirect', it works for me!
The best solution i found is using Firebase Hosting (for FREE)
Then you don't have to have a website/domain for your app-ads.txt. You can host it for free on Firebase.
here is a HowTo from Google on how you can achieve this. Publish app-ads.txt with Firebase Hosting
The beauty of this solution is that you can still redirect to Firebase Url created to any website you want.
For instance in you Google Play account, you published the URL of your social Media as you website. without the redirection you have to put the Firebase URL there, but with the redirection, you can still have your own Website/URL in the Google Play Console and redirect the firebase URL to it. the user will not see any difference or changes.