How to track Auto-Payment transactions?

• Transaction Successful

If the transaction is successful, the Payment and Invoice records will be updated with the status as Received Invoice and PAID, respectively.
Simultaneously, a transaction record will be created automatically with the status Success.

• Transaction Failure

If the transaction failed, the following records would be updated with the status as follows,

1. Payments status = Failure
2. Invoice Status = Overdue
3. Transaction Status = Failure 

Based on the AutoPay you have configured, the process will perform the actions.

Refer to this link for more details.