What is the payment address for this Apple Pay card which I would pay through a balance transfer payment

You may want to review the support article linked below for supported methods of paying your Apple Card statements.

How to make Apple Card payments - Apple Support

If you’re trying to pay via an unsupported method, please contact an Apple Card Specialist at Goldman Sachs Bank.

CONTACTING — Goldman Sachs Bank 

• Using Messages; chat with an Apple Card specialist

• Call toll-free at 877-255-5923

• Write to: Goldman Sachs Bank, Lockbox 6112, P.O. Box 7247, Philadelphia, PA 19170-6112.

Apple does not accept payment on Apple Card MasterCard. Goldman Sachs Bank is the issuer and servicer of Apple Card accounts. Goldman Sachs considers payment by check as non-conforming and may refuse acceptance of a check if the account owner does not call and verify acceptance of a check with an Apple Card Specialist.

You can make an Apple Card payment online at card.apple.com.

If your iPhone is missing or stolen, you can contact Apple Support to make a payment.

If you set up Apple Cash and verified your identity, you can use Apple Cash or your bank account to make an immediate one-time payment. Information on payment with Apple Cash is in the support article linked below.

How to make Apple Card payments - Apple Support

Payment by check is considered a non-conforming payment method. If you must mail a check, call first to verify acceptance. If you fail to call and verify acceptance, your payment/check may be returned and you’ll be responsible for any late payment or interest charged to your account.

CONTACTING — Goldman Sachs Bank 

• Using Messages; chat with an Apple Card specialist

• Call toll-free at 877-255-5923

https://www.goldmansachs.com/terms-and-conditions/Apple-Card-Customer-Agreement.pdf

I hope it’s safe to make payment through Goldman Sachs bank