You can send the invitation to a vendor's main email address, or to any of their contact persons.
In either Vendors or Contact Persons browse, choose at least one item and the button "Invite to Vendor Portal" will appear on top of the page.
It will send an email to the chosen recipients.
You can customize the email in Configuration > Templates > Notifications > Templates > E-mail/Text Message to Vendor's Contact Person: When vendor's contact person has been invited to join the portal.
The first person to receive an email becomes the Vendor Portal administrator.
Customer support service by UserEcho