To update your billing email address inside A2X, go to your A2X Settings > Billing, and click on 'Change' under 'Payment Method':
Then click on 'Change Payment' as shown below:
You can change your email in the next form either in Credit Card or PayPal tab, depending on how you pay. (Your current billing name and email will show. Below screenshot is only for illustration purposes.)
Click on 'Update Subscription' to complete the email change. When your next subscription payment goes through, you can either check for the invoice in your email inbox or check A2X Settings > Billing, where you should see the new email in the 'Payments' section, 'Paid By' column.
This means that you've successfully changed your billing email and it will be reflected on your next monthly billing!
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