Hi and thanks first of all,

We are beginners with Merchello and we are trying to generate a invoice and payment with the basket.GetCheckoutManager(), if we dont put any Coupon it works correctly and when we do the payment attempt generates the redirectUrl to paypal with the Token. The problem appears when we add a coupon to this same invoice, paypal dont generate token. In the attempt variable (var attempt = checkoutManager.Payment.AuthorizePayment(paymentMethod);) we found this error in -> Payment.Result.ExtendedData

If we check the invoice generated all is fine and have the four Items (product 20€, Tax 2€, Shipping 10€ and the coupon -10€) with the correct total amount = 22€

This is the base code where we are working

    public string GenerateInvoice()
    {
        var currentCustomer = MerchelloServices.CustomerService.GetByLoginName("[email protected]"); ;
        var basket = currentCustomer.Basket();
        var product = MerchelloServices.ProductService.GetBySku("producto01");
        basket.Empty();
        basket.AddItem(product, product.Name, 1);
        basket.Save();

        var checkoutManager = basket.GetCheckoutManager();

        var shipAd = new Address()
        {
            Name = "a",
            Address1 = "a",
            Address2 = "a",
            Locality = "a",
            Region = "a",
            PostalCode = "a",
            CountryCode = "ES",
            Phone = "a",
            Organization = "a",
            AddressType = AddressType.Shipping
        };
        checkoutManager.Customer.SaveShipToAddress(shipAd);

        var billAd = new Address()
        {
            AddressType = AddressType.Billing,
            CountryCode = "ES"
        };
        checkoutManager.Customer.SaveBillToAddress(billAd);

        var coupon = MerchelloServices.OfferSettingsService.GetByOfferCode("11");
        checkoutManager.Offer.RedeemCouponOffer(coupon.OfferCode);

        IShipment shipment = basket.PackageBasket(shipAd).ElementAt(0);
        var shipmentRateQuotes = Enumerable.Empty<IShipmentRateQuote>().ToArray();
        shipmentRateQuotes = shipment.ShipmentRateQuotes().ToArray();
        if (shipmentRateQuotes.Any())
        {
             checkoutManager.Shipping.ClearShipmentRateQuotes();
             checkoutManager.Shipping.SaveShipmentRateQuote(shipmentRateQuotes.First());
        }

        //Default method is PayPal
        var methodsPayment = GatewayContext.Payment.GetPaymentGatewayMethods();
        var paymentMethod = GatewayContext.Payment.GetPaymentGatewayMethodByKey(methodsPayment.FirstOrDefault().PaymentMethod.Key);
        checkoutManager.Payment.SavePaymentMethod(paymentMethod.PaymentMethod);

        var attempt = checkoutManager.Payment.AuthorizePayment(paymentMethod);

        return "";
    }

Regards,