When you register for the Business Customer Gateway you get the following:

24/7 access to your PostalOne! account balance information
Reminders can be set for low balance alerts or permit fees due alerts
Create an electronic postage statement
Manage your mailings
Audit Mailing Activity
Get mailing reports
Create an Every Door Direct Mail (EDDM) Mailing
Get your Mailer ID (MID)
Create a Full Service IMB mailing using the IMsb Tool
Register for Incentive Programs
Order mailing equipment
Create a FAST Mailing Appointment for drop shipments
Create a Package Intercept account
Register for Online Enrollment