Billing
constructor(billingKey: String, orderName: String, amount: PaymentAmountInput, currency: Currency, storeId: String? = null, channelKey: String? = null, customer: CustomerInput? = null, customData: String? = null, installmentMonth: Int? = null, useFreeInterestFromMerchant: Boolean? = null, useCardPoint: Boolean? = null, cashReceipt: CashReceiptInput? = null, country: Country? = null, noticeUrls: List<String>? = null, products: List<PaymentProduct>? = null, productCount: Int? = null, productType: PaymentProductType? = null, shippingAddress: SeparatedAddressInput? = null, promotionId: String? = null, bypass: JsonObject? = null)