Payment Batches Setup Options for Document Approval 
Settings > Document Approval > General Options > Approval Sources > Payment > Edit

Use payment batch approval workflow: Activates approvals with Payment Batches.

Require "Send to Reviewer" comment: Optional setting for require comment.

System Notifications

Notify submit user:

• When payment batch disapproved: A notification is sent to the submitter when a Payment Batch is disapproved. The notification email contains the reason provided for disapproval.
• When payment batch fully approved: A notification is sent to the submitter when a Payment Batch is fully approved. 
• When payment batch deleted: A notification is sent to the submitter when a Payment Batch is deleted, regardless of the Payment Batch’s approval status. 

Notify administrator when submitted is only approver and payment batch is auto-approved: If the final approval table created for a Payment Batch contains only the submitter, it is auto-approved. When this happens, a notification is sent to the system administrator(s).

Notify user(s) when payment batch ready to be posted (comma separated): A notification is sent to the specified email addresses when a Payment Batch is eligible to be posted.