First install QR code package into destination Oracle Database Shema (files: definition "ZT_QR.pks" and body "ZT_QR.pkb")

Optionally import Demo Oracle APEX application into Your APEX instance (file "QR Codes - Apex app.sql").
Within application You can:
- debug QR Code generation
- test QR Code representation as HTML table
- test QR Code representation as BMP image