Reactivate a frozen card to allow transactions again.
ACTIVE status and can be used immediately.
| Parameter | Type | Description |
|---|---|---|
cardId | string | The unique card identifier |
| Status | Error Code | Description |
|---|---|---|
| 400 | CARD_TERMINATED | Cannot unfreeze a terminated card |
| 409 | ALREADY_ACTIVE | Card is already active (auto-syncs local status) |
| 500 | UNFREEZE_FAILED | Failed to unfreeze card at the bank partner |