It depends how you pay. I believe that via a web browser, it is the original price. If you pay via Android or iOS it costs 30% (I think) more due to extra fees added on top by Google and Apple. The worst thing is, I don’t even get the money from them until ages later. For reasons I don’t understand, Apple holds the money in their account for 75 days before passing it on to Patreon.
My advice would be to always use a laptop or desktop computer to avoid being ripped off.