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public static PaymentParams createFromRetail(NexoRequest req) {
        PaymentParams params = new PaymentParams();

        if (req instanceof PaymentRequest) {
            PaymentRequest paymentReq = (PaymentRequest) req;

            String saleReferenceID = paymentReq.SaleReferenceID;
            params.paramTree = TlvTree.FromRaw(paymentReq.preparedPaymentData);
            TlvTree acquirerProprietaryData = params.paramTree.AddChild(0xFFBF2FParams.ACQUIRER_PROPRIETARY_DATA);
            acquirerProprietaryData.SetAscii(0xDFCF01Params.SALE_REFERENCE_ID,saleReferenceID);

            ...
            
        } else if (req instanceof ReversalRequest) {
            ...
            }
        } else {
            ...
        }
        ...
    }