Ver 11.19.0
Support multiple backup data

Ver 11.16.9
Update prefix by.u
Fix customer input dialog

Ver 11.16.2
Fix barcode
Buy active period only using google play

Ver 11.14.14
Min version: Lollipop

Ver 11.14.6
Fix last month to date summary report
Fix search mechanism on transaction history
Add PIN for product discount

Ver 11.13.6
Fix print barcode if character is not barcode 128
Searching item code / item name in product report
Add search based on receipt number in transaction history