I buy 5 gift cards everyone for $100 how can get the redeem code

Apple Support's online article:

How to redeem your Apple Gift Card or App Store & iTunes gift card - Apple Support

says eg: "Find the 16-digit code on the back of the card.

For some gift cards, you might need to peel or gently scratch off the label to see the code".

Also: "To redeem a gift card that someone emailed to you,

open the email and tap or click the Redeem Now button".

Thank you for kindly letting us know we helped, DraChristinaBrown.

Cheers :-)