In Amazon, to become a verified seller you have to register yourself as a seller and you have to receive a TIN number from the tax department . I have no idea whether this works here or anyone is free to buy and sell on his own .
In the Amazon you can not choose to receive payments only with bitcoin only, they give buyers to choose own payment options. the only way if not through this forum or create a online shop that only accept bitcoin for the payment.
Yes you are right, but although Amazon doesn't accept bitcoin as payment method we still can shopping on there. And using bitcoin as payment method via third party using purse.io and we can get discounts too on there.