title: Missing email notification in Paypal Sandbox
body: <p>Usually Payment Notification email would be sent to buyer and seller.  For some reason, I do not see this in Paypal Sandbox Notification list of both buyer and seller.  However when login buyer or seller Paypal Sandbox account, the transaction is there but no notification was received.</p>
  
  <p>I checked the setting, the email notification is set by default.<br>
  Also when test issuing refund, for some reason, the notification email is sent out (i.e. listed in Notification menu).</p>
  
  <p>Help.  What do I miss and suggestion please?</p>
  
  <p>Thank you.</p>