title: Paypal Buyer Transaction Number and Seller Transaction Number Different
body: <p>I am testing payments via paypal sandbox and I noticed that the txn_id passed via the ipn is different from the transaction number the "buyer" gets. I also noticed that the transaction number for both buyer and seller is different.</p>
  
  <p>Is it a bug on the sandbox site? or just the way it is?
  How am I able to track transactions pertaining to specific buyers later if both the transaction numbers are different?</p>
  
  <p>Thanks in advance.</p>