Billers are the selling companies (you or your companies/organizations), you can sell/quote/invoice your customers with any biller, means you can have multiple companies/organizations and can assign any of these to your staff so that all of their sale will be under assigned billing company. Only users with owner group rights can add billers. Logo, Company, Name (Contact Person), Email, Phone, Address and City input fields are required. This module is simple to use and manage the biller. The interface is quite easy to understand. The logos can be uploaded by visiting the change logo under settings and once uploaded you need to edit the biller to set the new logo.