If you have a subscription through the App Store or Google Play Store, update your billing options there. If you have your subscription via Stitcher.com…
If you need to change or update the card on file for your account follow these steps.
1) Login on Stitcher.com
2) Select "Settings" from the dropdown
3) Click "Manage" next to the auto-renew button
4) Click "Update Renewal Payment Method"
5) Enter the new card and save changes