XF 1.5 Paypal user upgrades - higher fees than before

I've just started using the Account Upgrades feature on my forum, previously people clicked a PayPal button on my old forum.

The fees for receiving via the Xenforo integration are higher! On $30 they went from $1.47 to $1.62. Does Xenforo get a cut or something?
Thank you - it's just coincidental timing that the last payment I received then was on the old fee schedule, and the first payment via Xenforo was on the new fee schedule. I hadn't seen any sort of disclosure from Xenforo that any type of affiliate fees, commissions etc would be levied on payments using the integration, so I was scratching my head.