How to make authorization through mail.ru work on the main domain and on subdomains?

Question

OAuth

I do authorization through mail.ru on the site. The same project but its different modules are located at the addresses example.com, subdomain.example.com, subdomain2.example.com. But in the application settings in mail.ru, I can specify only one site address and only one reciever.html file address
. And thus, authorization works only on one of the domains that I specify in the settings. How can I make authorization work on all three domains?