Write a cashier's ARM program

Programmer services are required. You need to write a program for a retail store cashier on Visual Fox Pro 9.0. .
The main purpose of the program is to record sales and recalculate prices according to the specified rules for calculating discounts and write-offs of bonuses and prepare a sales report for the shift in the form of a dbf file for transfer to the existing commodity accounting system, written also in VFP.
The program must work with a barcode scanner connected to the keyboard break. No need for weight support. The support of fiscal registrars is not required. The program only has to prepare a check file of a certain format, which will send another program to the fiscal registrar. The program should support work with discount cards with a barcode. The cards must be cumulative. There are two types of cards – interest and bonus. The program should maintain a database of savings on cards. The program should allow you to fix the combined type of payment of the check (cash, terminal, bonuses, credit) The program should keep records of debtors.