How to verify website ownership for Google Play?

Question

Google Play

I made an application for the customer (WebView for his site). Google refused to publish, arguing that
"
After further review, we found that the main purpose of your app is to provide a webview of the following website: " http://....... "
It's a violation of the Webviews and Affiliate Spam policy to publish an app where the primary purpose of the app is to provide a webview of a website without permission from the website owner or administrator
. you are authorized by the site creator/content owner to redistribute the content in this manner, please reply with verifiable documentation.
Examples of verifiable documentation include, but not limited to : distribution agreement, authorization contract, website domain information, website domain ownership and et cetera(.PDF).
"
What kind of documents do they ask for and how can they prove that we (the customer) are the owners of the site

Answer 1

pdf must be provided.
take from a domain name registrar.
(for example, in nic.ru (Ru-Center) - is there)

Answer 2

They can also find fault with the point of the rules that the application should be of value to the user without the Internet.