FIK - the taxpayer receives this code by registering the payment and sending a data message to the EET system; it is required to be printed on the receipt.
PKP - printed in offline mode.
BKP - the taxpayer's security code; always printed.
FIK, BKP, PKP - When Each Value Is Printed
Condition for printing FIK, PKP and BKP when submitting to EET
Written by Lenka Haringerová