Combining plugins membership and marketpress

Hi, I would like to ask, is it possible to share payment gateway engines between the Membership and the Marketpress plugins? I mean both plugin should use the same gateway engine which could be configured only once. In my case the Moneybookers gateway is available in MarketPress but not in the Membership plugin.
The reason is that I'm working on a site where users would be managed on different levels depending on their subscriptions, but in parallel a webshop would also be available for the already registered members and for visitors also as usual. Additionally I need to implement some kind of comission system between users, thats why I'm thinking on to use the membership plugin also, not just the webshop alone. Thank you in advance!