You can configure ApprovalMax in a way that notifications about the most important events regarding Bills are sent to a particular email address.
Notifications will be sent about:
Approvals
Rejections
Comments
This is how you set up notifications about Bills pulled from NetSuite
Unfortunately, it is not possible to configure ApprovalMax so that it notifies the actual person who created a particular Bill in NetSuite (because NetSuite doesn't share via the API who has raised the Bills).
In fact, only the one user who was specified in the first step (Pulling from Oracle NetSuite) in the Vendor Bill Approval workflow will receive notifications.
You can specify the email address to which you want notifications sent in the Pulling from Oracle NetSuite section of the Bill Approval workflow:
Users specified as a Requester can turn on instant notifications in My Profile > Notifications under their avatar: