Converting a system Custom for one merchant to unlimited merchants system (CodeIgniter)

1- Account categorization for login based on permissions (System Owner and System Administrator), (Merchant Account), (Merchant Seller Account). The system homepage opens, displaying and hiding system properties based on sorting by subscription type, subscription duration, activity, country, system type, account status, and adding the option to log in to the system via (Merchant ID, Username, Email, or Mobile Number + Password). 2- Add statistics to the system owner's homepage displaying (number of system administrators, total number of merchants, number of subscriptions expiring within one month, number of Basic subscribers, number of Pro subscribers, and number of Pro Plus subscribers). (On the ""Add New Merchant"" page, add: Merchant name, company name, company phone number, email address, company address, merchant logo, currency, country, activity, system type, subscription type, and subscription duration: six months, one year, two years, or five years). 3- Convert all system screens (Home, Sales, Purchases, Expenses, Products, Distributors, Customers, Returns, Calendar, Settings, Reports, etc.) that are currently ready and functioning correctly before the order is placed in Upwork and are currently designated for use by only one merchant, to use by an unlimited number of merchants. Review all system screens after the order is completed. 4- Each merchant must have their own operations and data. No system data should be shared with another merchant. Careful attention must be taken to review each merchant's data privately. 5. The system settings must be saved for each merchant individually, ensuring there are no conflicts or errors in the system, and that the project is delivered fully functional and error-free across all system screens. ****Please make sure you understand the request before accepting.****