3 digit security code on back by signature line.
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Usually, a visa card has 16 numbers.
6
Visa card has 16 numbers in their new cards, and 13 numbers in the old ones.
There are 16 numbers on a visa. Each Visa card will always begin with the #4. So if you have a visa the card number will be something like this: 4*** **** **** **** with a 3 digit security code and an expiration date.
Validation means to after verification the data is correct or not, verification means cross checking the data with record , or with original documents.So its like your visa card is verified that its on your name, but its valid or not will be know by either you or the bank, means when you swipe you card if there is no money then the card is verified but not valid.