I would save my money and just cash checks. The cost is not worth the convenience. But this is my experience with gateways/processors: Paypal is a nightmare to

I would save my money and just cash checks. The cost is not worth the convenience. But this is my experience with gateways/processors: Paypal is a nightmare to deal with if you ever need to call them. Their development stuff is awkward and buggy. I would not recommend them. Auth.net works, but that's about all I can say for them. Support, UI, and API are all lackluster. Chargify (which is great) mitigates most of this, if you go that route, but it's probably overkill for client billing. Braintree is awesome - great support, great API, great everything. Except price. They're significantly more expensive at low volumes and haven't been very flexible (probably because they don't have to be) on price.