oscommerce 2.3.1 modifications

Budget max is depending on delivery time: -160$ fast - if delivered on Tuesday -140$ normal - if delivered on Wednesday -130$ slow - if delivered on Thursday Terms: a) Do not miss deadline or delivery time schedule. b) Do not send wrong bids or ask for another negotiation afterwards or ask in chat for other pricing. c) Do not bid if you can not do properly, not in time, not in budget. d) Do not ask for other payment methods different from freelancer.com. We do ONLY accept freelancer.com milestone/escrow. No western union, skrill, bitcoins or scam! e) For all development and versioning, we use git repo. (no SVN or unprofessional attachments) All deployment and review is done in git ONLY! f) We will NOT provide DB or access to the SSH/FTP. You work in your environment for all testing and development. NO development or testing in live production environment! g) You must have your own unix-based apache2/lampp for working on this. We test and review the result in your url that you tell us for approval. The project is split into 3 milestones where payment is equal for each: Milestone 1: As first task and warm up, before our hoster upgrades the shared webserver to latest PHP version, you must check and make sure the existing oscommerce shop to be prepared for PHP5.5 (At the moment, we run on PHP5.3.) Show the successful result on your URL and we review to complete that milestone. Milestone 2: For iselands, the postal station is charging extra cost to our shop customers. This means, if the shop user wants the order/item to be sent to an address with zipcode of the list [40222,50219,11461,11462,11463,...] then we must add 2.50 to the shipping cost in order process. Milestone 3: For editing completed orders in the admin backend, we need an option for changing the order's amount/items/price/tax. Requirements: 1) You must be a quick expert in oscommerce for solving this task. 2) Confirm that you have read and understood a,b,c,d,e,f,g. 3) Confirm that you are available for start by now, know the milestones and are able to complete the task 100% without delay. 4) Provide a link to your host where you will do development and testing on, by phpinfo() to check the version and system. We look forward to welcoming a smart expert developer.