iTunes card

the code entered is not valid

See also this Apple article:  If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card

If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card - Apple Support

Card is not valid

If you see a message that says that your card is not valid, here's what to do:

1. Make sure that your card is not an Apple Store Gift Card. Apple Store Gift Cards are gray, white, silver, or gold. You can’t redeem Apple Store Gift Cards in the App Store or iTunes Store. Find out what to do if you have an Apple Store Gift Card or don't know what type of gift card you have.
2. Try entering your redemption code manually. When you redeem a gift card, tap or click "You can also enter your code manually." Make sure that you enter the redemption code that begins with "X", not a different number on the card.
3. Make sure that you enter the correct characters. Some letters and numbers look alike, such as:

• B and 8
• D and O
• E and 3
• G and 6
• O and Q
• O and 0
• S and 5
• U and V
• Z and 2

Beware of -> About Gift Card Scams -> About Gift Card Scams - Official Apple Support 

Get support from Apple directly -> Get Support or call Apple in your region see -> Contact Apple for support and service or check -> here for more support and assistance.

Jolenepaul Said:

"iTunes card: I am trying to redeem a ITunes card I just purchased and it cannot be redeem the code entered is not valid"

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Avoiding Gift Card Scams:

A. Contact the Seller.

Whomever the seller is, ask them for a refund...

B. Where was the Purchased?

• Online?:

If this was purchased online (i.e. eBay) then contact the site, seeing if the seller can be accountable and if you can get your money back.

• In-Person?:

If this as purchased in person, then there may be nothing you can do but contact them, asking for your monkey back.

Or...

• A Retailer?:

If purchased at a retailer, take it back, asking what your options are for return. Gift Card return policies vary by rules of law. So, take to the Manager, asking if you can get a new card.

C. Avoiding Scams:

In all recommend getting it at a retailer - that way you can easily avoid scams. Getting it online might result in scams (and plenty are reported).

Go Here: Recognize and Avoid Phishing Messages, Phony Support Calls, and Other Scams - Apple Support

Take it back to the store where you bought it.