Openbravo POS modification

Requirements: I have the modified version of Openbravo POS and I need to integrate some features on it, please see below: 1. Capability to distinguish different type of discounts(Senior Citizen,Individual Item discount etc.) in the reports. 2. Cability to restrict user from using the negative button/keystroke in Edit line of Sales Transaction menu 3. Z-Reading feature. Prints z-reading in receipt printer Sample of Z-reading report Terminal: From: To: GROSS SALES Item discount - Additional Discount - Group Discount - Senior Citizen Discount - ---------------- Net Sales - VAT SALES Vat Sales - Non-Vat Sales - Zero Rated Sales - VAT (12% of Sales) - ---------------- Net Sales - VAT RETURNS Vat returns - Non-Vat returns - Zero-rated Returns - VAT(12% of Returns) - ---------------- Net Returns - VAT SUMMARY(SALES-RETURNS) VAT Sales - Non-Vat Sales - Zero-Rated Sales - VAT(12% of Sales) - VAT(12% of Returns) - VAT Exemptions) - ---------------- Vat Due - CASH IN DRAWER +Deposit - +Payments - -Withdrawals - -Returns - ---------------- Cash in drawer - PAYMENT SUMMARY Credit Card - Cash - Debit Card - ---------------- Total Payments - Returns - VAT Exemptions - ---------------- Net sales after returns - **************** ACCUMULATORS Trans Reset Count - OR Reset Count - Accum. Net Sales - Accum. VAT Sales - Accum. Non-VAT Sale - Accum. Zero-Rated Sales - Accum. VAT Amount - Accum. VAT-Exempt Amount - ---------------- TOTAL - Accum. Net returns Accum. VAT Returns - Accum. NON-VAT Returns - Accum. Zero Rated Returns - Accum. VAT Amount - Accum. VAT Exempt Amount - ---------------- TOTAL - Accum. Net sales after returns Accum. VAT - Accum. Non-Vat - Accum. Zero-rated - Accum. VAT Amount - Accum. VAT Exempt - ---------------- TOTAL - First count: - Last Count: - Transaction Count: - ------------ 4. Add Serial Key feature --I will assign a serial for each installer --Once they run the software, it will ask for a serial and email --After inputting the serial, the software will connect to my server via internet and do the following authentication process: ---Verify if serial is valid ---Log the IP address, Serial key and Email of the user ---Sends a notification email(w/ complete details) to admin ---Server sends a certificate to client ---Certificate is valid for 30 day --Client computers automatically request new certificate to server after 15 days --If connection cannot be made a notification message must pop out upon opening of application: "Renewal of your license cannot be made, please contact the supplier as soon as possible to avoid any inconvenience. You still have X days left before your license expires." --If the license expires, the software must deny access to user anymore unless renewal process has been executed properly.