The Reference Number (Ref #)field for Offline payments in Bill.com syncs to the Document/Check No. field in Sage Intacct. You can find it in the Sage Intacct Check Register or in each individual payment in the Posted Payments section.
If you do not see the described feature available in Bill.com, you may not have access to the feature based on permissions for your role and/or your plan does not have this feature. If you wish to get access to the feature, please review the available plans for Bill.com and upgrade accordingly or contact the Administrator of your Bill.com account. Changes in monthly user fees may apply.