I already have the web service API, but not completed yet, you need to add some functions to make the system perfect.
I want to build app where merchant and customer can connect, tracking each other, buying stuff and delivery the goods to customer. If you already made this system before, that will be advantage, we just customize the system, products and designs. I don't want to build from scratch.
My budget is 150 dollars for iOS and Android
I need the source code too, that will be good if you use single codes with cross platform (Android and iOS). I prefer Hybrid Mobile Programming using IONIC, ANGULAR JS, PHONEGAP, CORDOVA, etc.