Step 1: Open your device Settings and tap "iTunes and App Store."
Step 2: Tap your Apple ID, then "View Apple ID." The email address used for your Apple ID will be shown here. Mine has been removed for security/privacy.
Step 3: Tap "Payment Information."
Step 4: Update your billing information, and tap "Done" in the top right.
We'd love to hear from you! Send us a note at firstname.lastname@example.org