reskin ios project

hello i have source code for an ios app. I need to add somethings to it. 1.) Provide app icon and splash screen (same as logo) and in app purchase screen where users can buy extra life. 2.) Add assets to the map. The app uses mapbox so you should be familiar with that. 3.) Write little code for game function. 4.) Add chartboost in app advertisement. 5.) upload app to my developer account. Simple project that should take no more than 5 days. Source code provided, assets/game characters will be provided. Once satisfied, more projects soon to come for same developer. We will discuss details for everything before start of the project... but to be clear, I will not release any milestones or anything before I get the source code after reskin. I can guarantee your money if I approved the project is done well. It's only fair that I release the money after I get the source code, able to test the project, and the project is uploaded to my developer account. The rules should be agreed before we start because, I had bad experiences with some of my past projects. Provide portfolio to be taken seriously. Thanks,