When an user purchases a subscription through iTunes, iTunes sends our system a receipt of the purchase so we can automatically sync the new subscription with the platform. Occasionally there are instances in which we do not receive the receipt, or the receipt is not recognized by our system. If you purchased a subscription and see that your subscription is invalid, please do not be alarmed!
Try navigating to the 'Me' tab, tap on 'Subscription Plan'.
Once there, tap on the 'Restore in-app Purchases' button. In most cases, this button should resolve the issue.
If this doesn't resolve the issue, please contact Customer Service directly at firstname.lastname@example.org so we can investigate further and get you up and running.