I’m trying to set up the pay per view plug in. I have a few questions: 1) I already have a paypal merchant account. Is it enough to put my current paypal credentials in the checkout settings or do need to create new api credentials? if the latter, how can I get help with that? 2) I need just to have one page and its children be by subscription; how do I do that? 3) how can I delete the popup at the top of every wP backend screen “install the free WPMU dashboard”?