Recommendation
Unfortunately, right now, I am unable to recommend PayBOX because the support has not been as good as I believe it should be.
If you’re going to make an income with the plugin you need good support. I’ve read many posts complaining about the support at PayBOX and I’ve experienced it firsthand.
Although the plugin itself is great, I cannot recommend to anyone that they use it to run a membership site on the WordPress platform. You need to have a more solid foundation for running your online business, even if it’s just a hobby.
The owner of PayBOX did put the whole site up for sale. I hope somebody buys it and continues to develop the software, because it really is a good plugin.