moves vertex_transaction_type to purchase object only in request as it isnt returned in repsonse

Author: sunny

Library/Adjustment.cs

@@ -93,11 +93,6 @@ public List<CustomField> CustomFields
         }
         private List<CustomField> _customFields;
 
-        /// <summary>
-        /// Optional vertex transaction type for tax purposes.
-        /// </summary>
-        public string VertexTransactionType { get; set; }
-
         private const string UrlPrefix = "/accounts/";
         private const string UrlPostfix = "/adjustments/";
 
@@ -284,10 +279,6 @@ internal override void ReadXml(XmlTextReader reader)
                         TaxCode = reader.ReadElementContentAsString();
                         break;
 
-                    case "vertex_transaction_type":
-                        VertexTransactionType = reader.ReadElementContentAsString();
-                        break;
-
                     case "tax_type":
                         TaxType = reader.ReadElementContentAsString();
                         break;
@@ -414,8 +405,6 @@ internal void WriteXml(XmlTextWriter xmlWriter, bool embedded = false)
 
             if (TaxCode != null)
                 xmlWriter.WriteElementString("tax_code", TaxCode);
-            if (VertexTransactionType != null)
-                xmlWriter.WriteElementString("vertex_transaction_type", VertexTransactionType);
             if (StartDate != DateTime.MinValue)
                 xmlWriter.WriteElementString("start_date", StartDate.ToString("s"));
             if (EndDate.HasValue)

Library/Purchase.cs

@@ -138,6 +138,11 @@ public List<string> CouponCodes
         /// </summary>
         public string TransactionType { get; set; }
 
+        /// <summary>
+        /// Optional vertex transaction type for tax purposes.
+        /// </summary>
+        public string VertexTransactionType { get; set; }
+
         #region Constructors
 
         internal Purchase()
@@ -281,6 +286,9 @@ internal override void WriteXml(XmlTextWriter xmlWriter)
             if (TransactionType != null)
                 xmlWriter.WriteElementString("transaction_type", TransactionType);
 
+            if (VertexTransactionType != null)
+                xmlWriter.WriteElementString("vertex_transaction_type", VertexTransactionType);
+
             if (NetTerms.HasValue)
                 xmlWriter.WriteElementString("net_terms", NetTerms.Value.ToString());
 

Test/Fixtures/purchases/invoice-with-vertex-201.xml

@@ -27,7 +27,6 @@ Content-Type: application/xml; charset=utf-8
         <total_in_cents type="integer">580</total_in_cents>
         <currency>USD</currency>
         <tax_exempt type="boolean">false</tax_exempt>
-        <vertex_transaction_type>lease</vertex_transaction_type>
         <created_at type="datetime">2025-11-25T22:00:00Z</created_at>
         <updated_at type="datetime">2025-11-25T22:00:00Z</updated_at>
       </adjustment>

Test/PurchaseTest.cs

@@ -291,33 +291,26 @@ public void PurchaseWithVertexTransactionType()
             adjustment.Currency = "USD";
             adjustment.Quantity = 1;
             adjustment.UnitAmountInCents = 580;
-            adjustment.VertexTransactionType = "lease";
 
             var purchase = new Purchase(account.AccountCode, "USD");
             purchase.Account = account;
+            purchase.VertexTransactionType = "lease";
             purchase.Adjustments.Add(adjustment);
 
             // Verify the request serializes vertex_transaction_type correctly
             var xmlOutput = new System.Text.StringBuilder();
             using (var xmlWriter = new XmlTextWriter(new System.IO.StringWriter(xmlOutput)))
             {
-                adjustment.WriteEmbeddedXml(xmlWriter);
+                purchase.WriteXml(xmlWriter);
             }
             var xml = xmlOutput.ToString();
             Assert.Contains("<vertex_transaction_type>lease</vertex_transaction_type>", xml);
 
-            // Simulate what Purchase.Invoice(purchase) would return by using a fixture
-            // This mocks the API response without making an actual HTTP call
+            // Verify that a valid InvoiceCollection can be deserialized
+            // (vertex_transaction_type is only sent in requests, not returned in responses)
             var mockResponse = GetMockInvoiceCollectionResponse();
-
-            // Assert the mocked response contains vertex_transaction_type
             Assert.NotNull(mockResponse.ChargeInvoice);
             Assert.Equal(mockResponse.ChargeInvoice.State, Invoice.InvoiceState.Paid);
-            Assert.NotNull(mockResponse.ChargeInvoice.Adjustments);
-            Assert.Single(mockResponse.ChargeInvoice.Adjustments);
-            Assert.Equal(mockResponse.ChargeInvoice.Adjustments[0].VertexTransactionType, "lease");
-            Assert.Equal(mockResponse.ChargeInvoice.Adjustments[0].UnitAmountInCents, 580);
-            Assert.Equal(mockResponse.ChargeInvoice.Adjustments[0].Description, "Test Adjustment");
         }
 
         private InvoiceCollection GetMockInvoiceCollectionResponse()