HEADER

Indicates the start of the file and the type of operation related to the file. The field has a size of 3 to 8 bytes and the possible values ​​for this field are: ADM, CHQ, CRT, CNC, CNF, NCN, PRE, PGV, PGB, EPH, INF, CEL, PCB, EMS, SHL, VIL, TCN, JGV, CONSCRED, CONSPGEN, CRTFIDEL, FTC, PROPRIET, WAYUP,TRICARD, TAPAGO, FORALL, PICPAY.*