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When posting a listing, you'll have the option of choosing from any previously entered billing information or adding new information! If you accidentally choose the wrong information, you can always change this on your invoice. To do this, go to your organization's Dashboard and find your invoice in the Invoices section. At the top of the invoice you should see the entered billing information. Next to that in blue will be the "Change" button. Click this and you'll be able to edit the invoice to reflect the correct billing information!
Please note that an invoice will not be generated until you select a payment method.