Can you up your plegde with paypal?

From what I understand you can up your pledge on kickstarter to get a higher tier reward.
So if you've already pledged $50 and you pledge an additional $40 you'd get the $90 tier reward.

I would like to do this but I can't pledge through kickstarter. So does anyone know if this is possible through paypal aswell?

I think they keep track by email.

viewtopic.php?f=61&t=34891

Great thank you for the reply.