We use PayPal Adaptive Payments. It's far from perfect: all paying customers must have a PayPal account and (in Europe) payments can be set up only for a year i

We use PayPal Adaptive Payments. It's far from perfect: all paying customers must have a PayPal account and (in Europe) payments can be set up only for a year in advance. The term "preapproval" is also likely to frighten some customers. Adaptive Payments was chosen as the standard recurring billing API doesn't allow us to automatically manage subscriptions, which becomes an issue if you have multiple plans. However, we had to implement billing scheduling ourselves. PayPal was for us the only option which didn't require us to store CC information on our servers.