Stingette: Why should it be a "challenge"? Since I opened an AlertPay account, I accepted almost 500 payments and nobody ever complained about any problems or complications.
I cannot bring back PayPal because, unfortunately, it turned out to be the worst option for merchants (although it might look like the best option for customers). There is no point to accept payments if they can freeze your account anytime and for any reason. Which means, you would be able to pay but I won't be able to get the real money.