For international selling on Amazon it is mandatory to set-up a valid account for payments to be made and received.
To ensure your International listings are activated, go to your Amazon Seller Central and go to Settings > and click on > Account Info.
Under Payment Information, click on > Bank Account Information and on the right hand side go to > Add.
Here you can add the relevant Bank Information to ensure your account set up is finalised:
All information related to this registering process, please check your Seller Central Account