20 posts and you want a user to send you £20 any you'll give them more than double back for there troubles why dont you just send it yourself??? I cannot see why you need someone to do this if you have £20 just send the 50 to your main account then close the account you sent it from.
You could send the £50 to me and ill transfer it to your main for you im verified and deal with big amounts all the time. This is what i dont get your sending money from PP to PP? but you need someone to send you £20 it makes no sense to me.