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Read onlyHow to Add a New Bank Card for Payments
Go in your seller central, type "Charge methode update" in the search bar, and the "Seller assistant" will guide you....
I recommend adding that card to the buyer side of your account first. Wait an hour or so, then go to the seller side and select that card.
It must be a true credit card -- not a debit card -- to work for activating a selling account.