Create Recurring Customer Payment plans against existing Open Invoices for a customer where a Payment will process on the Interval you define, email the customer an updated Invoice with new Balance Due as well as Post that payment to QuickBooks against that Invoice.
Create Recurring Customer Payments that automatically email the customer a Payment Receipt, posts into QuickBooks as an Unapplied Payment for you to apply to Invoices at a later date.
You can use unused credit memos or unapplied payments in the RECUR360 portal as a payment towards an existing invoice. In addition, let your customers pay online using their credit memos and unapplied payments.