CRM system with integration with the site

You need to write a simple CRM system with integration with your existing site. Data in the CRM-system must be supplied using the so-called API, which also need to be written.

The main objectives are:
The CRM system must automatically make backup copies of the database on a schedule.
CRM-system must be able to export data to 1C and exel.
The CRM system must run on a server with PHP 5.
The CRM system must use the MySQL database.
CRM-system should support authorization from one account, but in different browsers.
The CRM system should allow the new manager to register, but he should have access to the CRM only after moderation by the administrator.