I am look for an expert Magento developer or programmer to help create a plug-in for me that will allow for me to edit or modify my existing magento shopping cart invoice. Basically once purchase is COMPLETED, I need to have a function that will allow for me to go to the existing invoice and EDIT/ MODIFY the current invoice including changing products, email address, phone #, pricing, adding additional product items or pretty much anything on an invoice that has been completed already. Also allows for me feature to make payments using multiple credit cards. I have 2 sites that are both magento so I need this plugin installed for both sites. No initial deposit, all funds to be escrowed and paid upon completion.
Current magento is 1.6.1
Max amount is $75.