Recurring payments (also called subscriptions, recurring billing, etc.) is a mechanism that enables a charge on a customer's card regularly without engaging neither the customer nor the merchant.
It's a perfect payment solution for all kinds of subscriptions, including web applications (accounts paid monthly or annually), magazine subscriptions, bills, etc.
Merchants often use recurring payments to charge their customers a constant amount within specific time periods (e.g. monthly), but it's also possible to use recurring payments with variable amounts or time periods if it suits your business model.
Recurring payments are free at PayLane; merchants are only charged the regular transaction fees.