Hi
My understanding of your requirements is as follows:-
1 - you have the bar code scanning accomplished! It just needs to be integrated into your database program.
2 - you have the structure of the tables that will make up your database
3 - the database will be stored in an area that will allow access by multiple programs.
4 - You want a b4a program that, when executed will do some housekeeping (erase all records that are 60 days or older from the database) then wait for a bar code scan. When a bar code scan is read a new record will be added to the database and balance field(s) updated based on the content of the code scanned
5 - the program will periodically update itself (the display) with the current balance
6 - you require the b4a source code
Assuming you have a code fragment in b4a that accesses the bar code scanner my proposal is for US$250 to be completed in a week (probably less) and payment by paypal.
You can get me via my email
timwil1963@gmail.com
Tim