HI there. I went through your project and I am interested. I have developed several web applications, management systems, websites and mobile apps.
I can offer the following options:
1) hourly basis (dedicated developer)
2) fixed price
These are a few technologies we are familiar with
Android, Payment Gateway Integration, iPhone, Website Design and Mobile App Development
Please feel free to share more info about your project
" I allocated and agreed to give a Freelancer the task of Developing my APP and Website "