credit_card.md

Credit Card Checker

The credit-card checker checks if the given value is a valid credit card number. If the given value is not a valid credit card number, the checker will return the NOT_CREDIT_CARD result.

Here is an example:

type Order struct {
    CreditCard string `checkers:"credit-card"`
}

order := &Order{
    CreditCard: invalidCard,
}

_, valid := checker.Check(order)
if valid {
  // Send the mistakes back to the user
}

The checker currently knows about AMEX, Diners, Discover, JCB, MasterCard, UnionPay, and VISA credit card numbers.

If you would like to check for a subset of those credit cards, you can specify them through the checker config parameter. Here is an example:

type Order struct {
    CreditCard string `checkers:"credit-card:amex,visa"`
}

order := &Order{
    CreditCard: "6011111111111117",
}

_, valid := checker.Check(order)
if valid {
  // Send the mistakes back to the user
}

If you would like to verify a credit card that is not listed here, please use the luhn checker to use the Luhn Algorithm to verify the check digit.

In your custom checkers, you can call the credit-card checker functions below to validate the user input.

• IsAnyCreditCard: checks if the given value is a valid credit card number.
• IsAmexCreditCard: checks if the given value is a valid AMEX credit card number.
• IsDinersCreditCard: checks if the given value is a valid Diners credit card number.
• IsDiscoverCreditCard: checks if the given value is a valid Discover credit card number.
• IsJcbCreditCard: checks if the given value is a valid JCB credit card number.
• IsMasterCardCreditCard: checks if the given value is a valid MasterCard credit card number.
• IsUnionPayCreditCard: checks if the given value is a valid UnionPay credit card number.
• IsVisaCreditCard: checks if the given value is a valid VISA credit card number.

Here is an example:

result := checker.IsAnyCreditCard("6011111111111117")

if result != checker.ResultValid {
  // Send the mistakes back to the user
}