Hello, I can help you with this application. I understand what you need, but it's not a simple application.
Is needed to do a good server like the client as well. Your budget is too low, because if you need to integrate all these functionality (even if are a few) you need to do a very stable code.
I've worked on a similar project (paying for taxy through paypal).
If you are interested I'm currently working with a team, we can develop this application. It will be multi platform Android, iOS, WindowsMobile etc. It will require less than a month. But the budget would be between 1500$ and 3000$.
To have any information, just contact me. Be careful to who says that can build this app for you with a lower budget, because they won't develop it well, and it is needed to be sure with your code when you manage money.