For Your PC

1. Install VendSys (Version 1.8.0.0)

For Your Android/Apple Device:

1. You can download VendSys Mobile X from the Google Play Store or Apple App Store
2. If you don't see it on the Android Play Store, use this QR Code or this link to download 1.4.8.3

For QuickBooks (Contact Support for Quickbooks Online)

First install QuickBooks 64-bit Integration
Then read Sales Tax in QuickBooks