luhn.md

Luhn Checker

The luhn checker checks if the given number is valid based on the Luhn Algorithm. If the given number is not valid, it will return the NOT_LUHN result. Here is an example:

type Order struct {
  CreditCard string `checkers:"luhn"`
}

order := &Order{
  CreditCard: "4012888888881881",
}

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

In your custom checkers, you can call the luhn checker function IsLuhn to validate the user input. Here is an example:

result := checker.IsLuhn("4012888888881881")

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