Why my itunes won't let me add a paypal when it says it's activitated?

Alright i'll try and explain this as clear as possible. I am station in iraq. I have an account with itunes but when I purchase music it tells me to verify my billing info. So I do. I am trying to add my paypal account and so I do everything to add it. It accepts it but then when I go to purchase a song it says to verify my billing info again. So I go to verify it and it doesn't have nothing down for the method of payment. Does anyone know why this is happening?