I use DevPay for S3stat. They built it as a way to upsell Amazon Web Services, but I don't use it that way. It turns out that it's also a dead-simple way to h

I use DevPay for S3stat. They built it as a way to upsell Amazon Web Services, but I don't use it that way. It turns out that it's also a dead-simple way to handle recurring payments for a web application. It's orders of magnitude less work to implement than Amazon's other payment services. The downside is that they don't put much love into it. Obvious features, such as manually cancelling a subscription or being notified when somebody cancels are missing, so there is a bit of pain to offset the ease of getting it up and running. That said, I'd use it again.