request.CreateCardSaveSession

{
    "cardSaveCancelUrl": "https://example.com/card-save/cancel",
    "cardSaveFailUrl": "https://example.com/card-save/fail",
    "cardSaveSuccessUrl": "https://example.com/card-save/success",
    "createCustomer": {
        "email": "email@example.com",
        "externalId": "12345",
        "phoneNumber": "+77091278923"
    },
    "customerId": "string"
}