https://kb.sambapos.com/en/2-3-13-a-how-to-add-service-charge-manually-by-using-a-button/
how to amend service charge using keypad input number and set?
https://kb.sambapos.com/en/2-3-13-a-how-to-add-service-charge-manually-by-using-a-button/
how to amend service charge using keypad input number and set?