C$++$ solutions:

$$ giftCard.h $-$ declarations of the class giftCard

$-$ private data members: such as Store Name, Card ID$,$ Date of

Expiration, Initial Amount, Current Balance, etc.

$-$ public methods: such as constructor$($s$),$ setter$($s$),$ getter$($s$),$ get

Days before expiration, get balance, make a purchase; etc.

$$ giftCard.cpp $-$ implementations of the public methods of the class

declared in the header file.

$$ tester.cpp $-$ main$()$ that contains test cases to use the giftCard class

o Construct a few instances $($objects$)$ of giftCard that belongs to the

same or different store$($s$)$

o For each giftCard

$$ Display the card profile $($store name, card ID$)$;

$$ Check the balance of the gift card;

$$ Check if the card is expired;

$$ Make a purchase using the balance of the card, if the balance

is insufficient, reject the purchase, and display a warning to

the user.

$$ Etc...