Automatic charge to customer credit card from Service Contracts billing schedule

So here is the situation...

we're trying to create service contracts with recurrent monthly/yearly billing schedules. The customer has enrolled in 'Autopay'.

We are automatically generating the billing entries in the AR Interface table and then the invoices.

From there, what we are trying to accomplish is to trigger Oracle Payments to integrate with these invoices and start the Authorization/Settlement of the payment for the specific invoice for the customer.

Once that is accomplish the receipt should be automatically applied to the Invoice and flag as paid.

The missing link here is the trigger of Oracle Payments to start the process to charge the customer's CC based on the invoice generated at the end of the month for the recurrent billing.