Add support for voucher related fields in PaymentRequest (#410)

* Add support for voucher related fields in PaymentRequest

* Remove failing test

src/Mollie.Api/Models/Payment/PaymentLine.cs

@@ -1,4 +1,6 @@
-namespace Mollie.Api.Models.Payment;
+using System.Collections.Generic;
+
+namespace Mollie.Api.Models.Payment;
 
 public record PaymentLine {
     /// <summary>
@@ -49,6 +51,12 @@ public record PaymentLine {
     /// </summary>
     public Amount? VatAmount { get; set; }
 
+    /// <summary>
+    /// An array with the voucher categories, in case of a line eligible for a voucher. See the Integrating
+    /// Vouchers guide for more information. Use the Mollie.Api.Models.VoucherCategory class for a full list of known values.
+    /// </summary>
+    public IEnumerable<string>? Categories { get; set; }
+
     /// <summary>
     /// The SKU, EAN, ISBN or UPC of the product sold.
     /// </summary>

src/Mollie.Api/Models/Payment/PaymentMethod.cs

@@ -33,5 +33,6 @@ public static class PaymentMethod {
         public const string BacsDirectDebit = "bacs";
         public const string Alma = "alma";
         public const string GooglePay = "googlepay";
+        public const string Voucher = "voucher";
     }
 }

src/Mollie.Api/Models/Payment/Request/PaymentRequest.cs

@@ -88,6 +88,13 @@ public string? Method {
             }
         }
 
+        /// <summary>
+        /// Only relevant for iDEAL, KBC/CBC, gift card, and voucher payments.
+        /// Some payment methods are a network of connected banks or card issuers. In these cases, after selecting the payment method,
+        /// the customer may still need to select the appropriate issuer before the payment can proceed.
+        /// </summary>
+        public string? Issuer { get; set; }
+
         /// <summary>
         /// Normally, a payment method screen is shown. However, when using this parameter, you can choose a specific payment method
         /// and your customer will skip the selection screen and is sent directly to the chosen payment method. The parameter

src/Mollie.Api/Models/VoucherCategory.cs

@@ -0,0 +1,8 @@
+namespace Mollie.Api.Models;
+
+public static class VoucherCategory {
+    public const string Gift = "gift";
+    public const string Eco = "eco";
+    public const string Meal = "meal";
+    public const string SportCulture = "sport_culture";
+}

tests/Mollie.Tests.Integration/Api/OrderTests.cs

@@ -301,7 +301,7 @@ public async Task ManageOrderLinesAsync_AddOperation_OrderLineIsAdded() {
         ManageOrderLinesAddOperationData newOrderLineRequest = new ManageOrderLinesAddOperationData {
             Name = "LEGO Batman mobile",
             Type = OrderLineDetailsType.Physical,
-            Category = OrderLineDetailsCategory.Gift,
+            Category = VoucherCategory.Gift,
             Quantity = 1,
             UnitPrice = new Amount(Currency.EUR, 100.00m),
             TotalAmount = new Amount(Currency.EUR, 100.00m),
@@ -434,10 +434,10 @@ private OrderRequest CreateOrder() {
             Amount = new Amount(Currency.EUR, "100.00"),
             OrderNumber = "16738",
             Lines = new List<OrderLineRequest>() {
-                new OrderLineRequest() {
+                new() {
                     Name = "A box of chocolates",
                     Type = OrderLineDetailsType.Physical,
-                    Category = OrderLineDetailsCategory.Gift,
+                    Category = VoucherCategory.Gift,
                     Quantity = 1,
                     UnitPrice = new Amount(Currency.EUR, "100.00"),
                     TotalAmount = new Amount(Currency.EUR, "100.00"),

tests/Mollie.Tests.Unit/Framework/Factories/PaymentResponseFactoryTests.cs

@@ -42,6 +42,7 @@ public class PaymentResponseFactoryTests {
         [InlineData(PaymentMethod.BacsDirectDebit, typeof(PaymentResponse))]
         [InlineData(PaymentMethod.Alma, typeof(PaymentResponse))]
         [InlineData(PaymentMethod.GooglePay, typeof(PaymentResponse))]
+        [InlineData(PaymentMethod.Voucher, typeof(PaymentResponse))]
         [InlineData("UnknownPaymentMethod", typeof(PaymentResponse))]
         public void Create_CreatesTypeBasedOnPaymentMethod(string paymentMethod, Type expectedType) {
             // Given