i am trying to place order online with gift card and trying to check out it is telling me to enter valid gift card number, do you add spaces where they are placed on the card, cause i tried it with no spaces and had same problem?

Did you unlock the gift card?

There's typically a "scratch off" part which reveals the last 4-digits of the Gift Card + it's associated PIN#. If you havent done that yet, please do; if you did, call the 800# on back of card for assistance...

It might be necessary to restart whatever device you're using, or restart the Walmart app. Hope this helps.