Is it possible to use cards across multiple domains without approval?



I develop a CMS type system for sports websites. By default users have a website on our domain. For example.

This is fine as I can get our URL approved for cards. However we also allow customers to use their own domain as a premium feature. So the above url would just become

Is it possible to somehow get our existing customer URLs bulk approved to allow cards or would they have to be submitted one by one?