The Bill Payments have the feature of adding the Approvers for the payment to go through. Both First level and second level approvers could be added.
The approval feature could be enabled or disabled at the budget level by selecting the corresponding budget which is used for the Bill payment. You can set multiple or single approver at each level or only the 1st level approver as well.
Go to Budgets and you can modify the settings as per the requirement.
Once the approvers are setup, and a payment is created, an alert will go to the 1st level approvers for review and if anyone of them approves, the next review alert goes to the 2nd level approver. When approved by both 1st & 2nd level approvers, the payment goes to the processing stage.