Yo, im from canada i buy only canadian dumps and i write them correctly on a prepaid card, the dumps are valid but where i hit the store to swipe my card at first it say decline and i dont know why i try with 5-6 different dumps and all of them didnt work.my track 1 and track 2 are correctly writed. Do i need to do before swipe my card ? Like i heard about Jam the chip but a didnt know what to do exacly. Thanks