1) What is the best way to add membership part...Just code it?
2) How do you handle billing and turn on/off access to those that have paid and those that didn't make a payment?
3) How do you keep access secure?
4) What is the best way to keep everything backed up and safe?
5) Outside of the above are there other critical things I need to think about.
I'm not new to software development, but I have never done SAAS before and I know customer service can suck.