Debt doesn't just get "dissolved". You currently owe the money to Goldman and will continue to do so until otherwise instructed.
Goldman's agreement with Apple likely specifies what happens, but there are a few possible scenarios:
- Goldman keeps the accounts open and transitions them to a non-Apple branded product. This is what Barclaycard did when their agreement with Apple ended.
- Goldman could close all of the their Apple Card accounts. When a credit card account is closed, no new charges are permitted, but the cardholder continues to make payments per the cardholder agreement until the balance is paid off. In conjunction with this, they could sell the debt to a third-party servicer.
- Goldman could sell the accounts to whoever the future Apple Card issuer is, or to a third party issuer unrelated to any deal with Apple. Cardholders would continue to make payments per the cardholder agreement.
- Goldman could sell the accounts to Apple itself, who would collect any balance remaining due. Apple currently owns and services the Apple Pay Later accounts through its Apple Financing LLC subsidiary, so that isn't entirely out of the question. If this happens, it's likely because Apple brings the whole Apple Card operation in-house.
Depending on how bad the situation ends up getting and the exact terms of Goldman's agreement with Apple, there could be some ugly hybrid where existing Apple Card holders have accounts automatically created with the new card issuer, but the outstanding balances don't go along with them and are paid separately to Goldman or someone else. There's also the possibility that the Apple Installment Payment balances are handled differently than "general" Apple Card balances, since the terms between Apple and Goldman for those may be different in terms of Apple's liability for bad debt.