Mobile development -- 2

I need an Android app. I already have a design for it, I just need it to be built. simple program auto launch on tablet start we will call it [login to view URL] [login to view URL] will have two distinctive areas on the screen. 70% top box will rotate ads in order from a predefined folder on the root of the device. you tell me the root location. the other 30% will be a banner along the bottom with a glowing "push to start" button. push to start needs to emulate the keysteoke of the X key on the key board. you you press to start it will bring upon a second screen with three payment options, each needs to be mapped to a keyboard key from a usb keyboard. Debit / credit / voucher. Once selected it will send an api call to a web service that will call the debit machine and the debit machine will call back the web service and back to the app saying approved or declined. [login to view URL] full api instructions upon request. in paralell a timer starts and after 60 secs the program restarts as we will assume peraon changed thier mind about paying once payment is approved it will launch a program. for now we will say chrome web browser. this is only phase one of a 3 phase project. we need this to get approval for next phases. brad