Walaikum Assalam, Sir it's very easy now just pay the amount through easy paisa, jazz cash or through bank atm etc and after payment you will receive an application id via sms, both buyer and seller have to do biometric by telling that application id to nearest nadra e sahulat markaz within one month time and in around two weeks it will be transferred, buyer and seller can even visit same excise office for biometric but i think it's easier to visit any nearest nadra e sahulat markaz for biometric.