Since AGE has taken agreement with PayPal to pay monthly.
It is great but if you need to cancel the payments, its not the most easiest thing to do, so..behold i have a guide how to cancel the payment
1. Go to the PayPal website and log in to your account.
2. Click on "My Account" and "Profile"
3. Select "My money" which is displayed on the left hand side
4. the fourth option " My Pre-Approved payments"
Select your payment you wish to cancel (i.e Aeria games)
and there should be a option to cancel your payments.
Hope the above would help.