To prepare for closing your Selling on Amazon account, make sure to prepare the following items:
Fulfill any outstanding orders.
Cancel all of your listings to remove them from sale on the Amazon website.
Resolve all of your transactions with buyers, including issuing any necessary refunds.
Confirm that you have valid bank account information on file to receive a final payment.
If you are a Professional seller, switch your selling plan so you won't be billed again.