Paying at once for two different apps

Hi,

I have two free apps in two different app store accounts.
Each app has its own premium subscription.

I would like to let the user pay at once for the two subscriptions. The payment should be using Apple.
The apps are not "Reader" apps.

When a user will buy a subscription inside one of the apps he/she will get a subscription for the other app automatically.

Will it be an infringement of Apple's Guidelines?
If not, what will be the best way to do so?

Thanks in advance.