Can I use Apple gift cards to buy an iPhone in the Apple Store?

Depends on the specific gift card. Apple gift cards, and Apple Store gift cards can be used to buy hardware, including iPhones from the Apple Store.

iTunes, App Store, and Book Store gift cards cannot be used for that.

Click here-> What type of gift card do I have? - Apple Support

Pagesr200 wrote:

Can I please use my gift card for my payment

Go ahead.

Is something preventing you from using your gift card? What kind of gift card is it?

What happens when you try to use it?

click here-> What type of gift card do I have? - Apple Support

Also, you may be better served by making your own post and clearly explaining your issue in as much detail as possible, instead of hijacking somebody else's post.

Can I please use my gift card for my payment