Build an Online Store

i wanna make confirmation payment page, underpayment page, aftersales page and all of them is integrated. Confirmation payment page is used for input payment data, it can be input by customer from front end also can be input by admin from back end. After the confirmation payment data input if the balance underpay it will create data on underpayment page, but if the balance over pay it will create data on aftersales page). And those data can be view by page which is named as Check 1 Page and Check 2 Page. Konfirmasi Page in image i attach means confirmation payment page, Kurang Page means Underpayment Page, Masalah Page mean aftersales page, for aftersales page we can create other's data record like the image i attach. for the detail project you can see the image i attach. i will give this project to developer which is already have a professional team developer, i need the coding created cleary and tidy. and i need this project to be complete 1month after the project started, if you confidently can complete all my requeirement place a bid and please also show me the hardest project you have ever made for opencart