diff --git a/src/Mollie.Api/Models/Payment/PaymentLine.cs b/src/Mollie.Api/Models/Payment/PaymentLine.cs
index 3b9932aa..247a0428 100644
--- a/src/Mollie.Api/Models/Payment/PaymentLine.cs
+++ b/src/Mollie.Api/Models/Payment/PaymentLine.cs
@@ -3,6 +3,7 @@
 public record PaymentLine {
     /// <summary>
     /// The type of product purchased. For example, a physical or a digital product.
+    /// Use the Mollie.Api.Models.Order.Request.OrderLineDetailsType class for a full list of known values.
     /// </summary>
     public required string Type { get; init; }
 
@@ -19,7 +20,7 @@ public record PaymentLine {
     /// <summary>
     /// The unit for the quantity. For example pcs, kg, or cm.
     /// </summary>
-    public required string QuantityUnit { get; init; }
+    public string? QuantityUnit { get; init; }
 
     /// <summary>
     /// The price of a single item including VAT. The unit price can be zero in case of free items.
@@ -27,14 +28,14 @@ public record PaymentLine {
     public required Amount UnitPrice { get; init; }
 
     /// <summary>
-    /// The total amount of the line, including VAT and discounts.
+    /// Any line-specific discounts, as a positive amount. Not relevant if the line itself is already a discount type.
     /// </summary>
-    public required Amount TotalAmount { get; init; }
+    public Amount? DiscountAmount { get; set; }
 
     /// <summary>
-    /// Any line-specific discounts, as a positive amount. Not relevant if the line itself is already a discount type.
+    /// The total amount of the line, including VAT and discounts.
     /// </summary>
-    public Amount? DiscountAmount { get; set; }
+    public required Amount TotalAmount { get; init; }
 
     /// <summary>
     /// The VAT rate applied to the line, for example 21.00 for 21%. The vatRate should be passed as a string and not
diff --git a/tests/Mollie.Tests.Integration/Api/PaymentTests.cs b/tests/Mollie.Tests.Integration/Api/PaymentTests.cs
index db4e45d9..6aab326c 100644
--- a/tests/Mollie.Tests.Integration/Api/PaymentTests.cs
+++ b/tests/Mollie.Tests.Integration/Api/PaymentTests.cs
@@ -17,6 +17,7 @@
 using Mollie.Api.Models.Customer.Response;
 using Mollie.Api.Models.List.Response;
 using Mollie.Api.Models.Mandate.Response;
+using Mollie.Api.Models.Order.Request;
 using Mollie.Api.Models.Payment.Request.PaymentSpecificParameters;
 using Mollie.Api.Models.Payment.Response.PaymentSpecificParameters;
 using Mollie.Api.Models.Terminal.Response;
@@ -360,6 +361,38 @@ public async Task CanCreatePaymentWithCustomMetaDataClass() {
         metadataResponse.Description.Should().Be(metadataRequest.Description);
     }
 
+    [DefaultRetryFact]
+    public async Task CanCreatePaymentWithLines() {
+        // Arrange
+        PaymentRequest paymentRequest = new PaymentRequest() {
+            Amount = new Amount(Currency.EUR, 90m),
+            Description = "Description",
+            RedirectUrl = DefaultRedirectUrl,
+            Lines = new List<PaymentLine>() {
+                new() {
+                    Type = OrderLineDetailsType.Digital,
+                    Description = "Star wars lego",
+                    Quantity = 1,
+                    QuantityUnit = "pcs",
+                    UnitPrice = new Amount(Currency.EUR, 100m),
+                    TotalAmount = new Amount(Currency.EUR, 90m),
+                    DiscountAmount = new Amount(Currency.EUR, 10m),
+                    ProductUrl = "http://www.lego.com/starwars",
+                    ImageUrl = "http://www.lego.com/starwars.jpg",
+                    Sku = "my-sku",
+                    VatAmount = new Amount(Currency.EUR, 15.62m),
+                    VatRate = "21.00"
+                }
+            }
+        };
+
+        // Act
+        PaymentResponse result = await _paymentClient.CreatePaymentAsync(paymentRequest);
+
+        // Assert
+        result.Lines.Should().BeEquivalentTo(paymentRequest.Lines);
+    }
+
     [DefaultRetryFact]
     public async Task CanCreatePaymentWithMandate() {
         // When: We create a payment with a mandate id