A PIN is a Personal Identification Number that is unique to your Walmart Gift Card. It is located on the back of your Gift Card in the bottom right corner under the silver scratch-off area.
If You Don't Have a PIN
For your security, Walmart.com can only accept cards with a PIN
If you have a plastic Gift Card that doesn't have a PIN, you can use it at a store but you cannot use it online at Walmart.com
Unfortunately, you cannot check the balance of a Walmart Gift Card that does not have a PIN, but you can trade it in for a new card with a PIN at any local Walmart store or Sam's Club in the United States