How do I redeem a gift card with only 15 digits?

Read again -> Related Article: If you can't redeem your Apple Gift Card or App Store & iTunes Gift Card

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Contact Apple Support -> Contact Apple Support.

You might need to provide:

• An image of the full front and back of your card.
• A sales receipt showing when your card was purchased.
• The serial number from your card. 

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

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I only have apple gift card but it only has 15 code

How can I redeem a gift card with only 15 digits code?