BAD track if u checke full track2 and u get Code 57 u can check again just cc+exp and ur get 00 APROVED reason can be a generated track2
valid CC-exp=1301201xxxxxxxxxxxxxx
xxxx= mean added some digit to complet track
when u check cc+exp to get Code 57 mean mostly holdpick card u can try by other merchant and your would see other CODE like 04-41-43 hold
Code 57 mean mostly bad card flaged or even blocked,....