         case branchId = "branch_id"
         case processingModes = "processing_modes"
         case collectorId = "collector_id"
+        case orderId = "order_id"
+        case merchantOrderId = "merchant_order_id"
     }
 
     required public convenience init(from decoder: Decoder) throws {

        self.payer = PXPayer(email: payerEmail)
    }

    internal init(id: String, items: [PXItem], payer: PXPayer, paymentPreference: PXPaymentPreference?, siteId: String, expirationDateTo: Date?, expirationDateFrom: Date?, site: PXSite?, differentialPricing: PXDifferentialPricing?, marketplace: String?, branchId: String?, processingModes: [String] = PXServicesURLConfigs.MP_DEFAULT_PROCESSING_MODES, collectorId: String?) {
        self.id = id
        self.items = items
        self.payer = payer

        self.branchId = branchId
        self.marketplace = marketplace
        self.collectorId = collectorId
        self.orderId = orderId
        self.merchantOrderId = merchantOrderId
    }

    /// :nodoc:
