Need fully editable invoice system functions, for a CodeIgniter website ... read the full details before contacting - urgent project - Budget 50$

Maximum budget: 50 USD (if the required budget is not enough, there is no point in mentioning that as I am not interested ... so don't waste my time or yours) I need the current invoice system functions on my website to be changed, or implemented so that it can be fully edited, to be able to change the name, the invoice number, the products, or to add new products to the list, as well as to be able to somehow save the clients' data, so that it will be easier for me to reuse. And of course the print button, save as pdf, or send invocation to customer mail. In short, I want the invoice function to be completely editable so that I can manage it the way I need, so that I can create new invoices at will or to re-edit ones already created when customer made a new order. It is very important that no other function in my website to be affected, or to occur any kind of error/bug. The website in question is: [login to view URL] Website framework: CodeIgniter It is important for me that the project to be completed within a short time.