My business is setting up online billing using PayPal and Google checkout. I'm looking for the best way to charge a recurring monthly service fee for my website. My site is subscription based and I charge X amount of dollars per month. I want to bill the customer's credit card each month for that monthly fee. The subscriber to the site knows that it is an ongoing monthly service charge when they sign up.
I'm looking for the quickest, easiest, best, most reliable way to charge this recurring fee. I'd prefer to have the monthly fee just show up on their monthly credit card statement like it does on mine for many services I use like Slicehost.
Google Checkout doesn't currently support recurring billing, but it is on their Feature Suggestions page.
PayPal supports Recurring Payments either manually or through their API.
I'd highly recommend using PayPal's API, as it's straightforward, well documented, and you can easily test everything out on your non-production sites by using PayPal's Developer Site.