paypal payment method for each registered user

[DeepaVaith]

I am a newbie to VM.
I am using VM2.0.1f with joomla1.5.  In my application, each I create a paypal payment method for each registered user as I
want the payments to go between the buyer and seller directly (rather than through the site).
In the paypal sandbox,  the buyer gets and email on order confirmation, while the seller does not.  What am I doing wrong?
Also, how can I disable the popup when I click the Add to Cart button?

Thanks,
Deepa