Read more about Understanding Clawbacks Due to ACH Returns.
In the case of an ACH return, you will receive an email notifying you of the failed payment. In this email, it will list the reason for the ACH return as one of the following three reasons:
Insufficient Funds: In this case, the tenant did not have enough money in their bank account for the payment. To send the tenant an updated charge related to insufficient funds, follow the instructions here: How to Fix a Failed Rent Payment for Insufficient Funds
"No Account/Unable to Locate Account": In this case, this means a tenant probably entered in their bank account info incorrectly. This means that the account and routing entered were invalid and they need to delete and reenter their info
Customer Advises Not Authorized/Stop Payment: You will want to communicate with your customer what will appear on their bank account statement. You will also want to insure all services/products are not provided or delivered.