Respected Sir,
I read the description of the project. Well, I think you need some web application with an android app. with the help of the app bill collector login using his/ her Name/pass, and select the user from which collecting the bill and select the option paid. In this way when the bill collectors return to the main office and submit his collection, it will be shown in the accounting department dashboard. This type of scenario is building which is best, i think..
My experties for this project is available.
Thanks and Regards,
Saif Ullah