Manual billing definitely has some drawbacks. My SaaS customers are split between those on automatic billing and those who log in every month to pay. Be aware

Manual billing definitely has some drawbacks. My SaaS customers are split between those on automatic billing and those who log in every month to pay. Be aware that people on manual billing (in my experience, anyway) tend to treat it like the cable bill - something they feel have a couple of weeks to pay. They never seem to catch up, either (e.g. 'I just paid that two weeks ago', oblivious to the fact they were two weeks late). And if you hammer them with billing reminders, they tend to tune out, and eventually miss that inevitable termination notice. I've had so many customers on manual billing passively cancel over the years (i.e. stop paying, not respond to emails) and then reappear out of the ether months later that I now wait at least six months to completely wipe their account data. Manual billing also forces customers to consciously reevaluate whether it's worth paying for your service every time they log in to pay a bill.