How can I check my balance on Apple gift card

Re: how can I check my balance on Apple Card before redeeming

Apple Card is Apple's "credit" Card: See your Apple Card spending history - Apple Support

or

Download or export your Apple Card statements and transactions - Apple Support

Your Apple ID Account may have a balance: Check your Apple Account balance - Apple Support

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Re: How can I check my balance on Apple gift card

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

and

How to: Check your gift card balance - Apple Support

If needed: You may want to check which payment methods Apple can accept in your country or region:

Payment methods that you can use with your Apple ID - Apple Support