I intend to business web applications but do not know how to create a system such as Bitrix24 or Kayako
Anyhow, when a user clicks the trial, the system will automatically create a subsystem run their web applications including self-installation and application configuration, user trial with domain subname.domain.com
After a time, the system will expire trial and paid users to maintain services.
Please let me know what this model is called and PHP Script available to do that. Thank you very much.
(My English not good)