Step 1 - Site Registration - Getting Started
The Getting Started page provides the information that you will need to register an MSP-specific PWN site successfully. Included is a link (https://www.windowbook.com/home/White-List-Help) to the list of email addresses used by PostalWeb (shown below) that you should have white-listed to ensure the necessary email communication between PWN/Window Book and the MSP can occur.
The WWID is required. Also, it saves you from filling out some of the information later. Enter your WWID and click Next.
It shows not required below, but the WWID is necessary for registration. Please do not click Next until the WWID is entered.