Requirements:
- The folder "invoices" should have 777 permissions
- The file "functions.php" has data connection to the database. Functions conectar() and conectar2();
- File "ch_manager_member.sql" contains the data and structure of the database.
- The application has been tested in the root of a domain and subdomain.
- The application handles the sending of e-mail notifications through file 'cron.php'