basically when you start selling you have to set up a seller account and verify cc and bank account and most people just go ahead and do so by linking their pp account because it is easy and already has all the information on it so all you have to do is log in to your pp account and then you're done and can sell. Or you can go under addresses in your account and link your pp account from their and then later on delete the address and remove the billing agreement from the pp account which will clear you up.
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