Blesta is a powerful billing system and it is being used by many web hosting providers for billing automation and account provisioning. Many web hosting providers go for Blesta because they have 99% open source code. That means you can check the source code for almost all files.
Blesta comes with many control panel, payment gateway, registrar etc. modules. These modules allow web hosting providers to integrate their servers, payment gateways and registrar for billing automation.
The cost of Blesta billing system is low comparing with other web hosting billing system. You can get unbranded Blesta license at just $9.95 / month. You can obtain license from any Blesta reseller and we recommend LicensePal for web hosting software license.