Having a zip code associated with a credit card on file is used for verification purposes during auto-renewals. There is no option to provide a complete billing address.
To update the zip code associated with a credit card on file, follow these steps:
STEP 1: Log into ForeFlight on the Web.
STEP 2: Click on the Account button in the left column (the title may be your name). The account management page will open.
STEP 3: Click Update your Payment Method.
STEP 4: Enter the new zip code in the ZIP / Postal Code field.
STEP 5: Click the Update button.
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