Golang : Validate credit card example

Problem :

You have an e-commerce website and you want to validate the user credit card number before passing it to the payment gateway or your own credit card processor. How to validate credit card number?

Solution :

Use the govalidator.IsCreditCard() function to validate the user's credit card.

For example :

 package main

 import (
 "fmt"
 "github.com/asaskevich/govalidator"
 )

 func main() {

 // from http://www.freeformatter.com/credit-card-number-generator-validator.html

 ccNumber := "5176865765334720"

 validCreditCard := govalidator.IsCreditCard(ccNumber)

 fmt.Printf("%s is a valid credit card : %v \n", ccNumber, validCreditCard)
 }

Output :

5176865765334720 is a valid credit card : true

NOTE : This is just to ensure that the number is valid, but you will have to do more security checks - such as CCV number, expiry dates, etc