diff --git a/CHANGELOG.md b/CHANGELOG.md
index a6d4150..709c6ba 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,13 +1,14 @@
 # Change Log
 All notable changes to this project will be documented in this file.
 
-## 3.1 Changes on 2021-04
+## 3.1 Changes on 2021-08
 - Amount is now optional on voids, collections and refunds.   If not specified, the remaining amount of the original transaction will be used.
-- Update Api-Version to 6.3
+- Update Api-Version to 6.6
 - Allow WebPaymentReference to be set on PaymentModel
 - Add AuthCode to initial receipt response
 - Add AuthCode, WebPaymentReference and Acquirer to response of Transactions.Get(receiptId)
 - New exemption flags ChallengeRequestIndicator and ScaExemption added to the ThreeDSecureTwo Model
+- Add PrimaryAccountDetails to RegisterCardModel and CheckCardModel
 
 ## 3.0 Changes on 2021-03-11
 - Update default base Urls with certificate pinning checks
diff --git a/JudoPayDotNet/Models/RegisterCardModel.cs b/JudoPayDotNet/Models/RegisterCardModel.cs
index dc868ae..4671e5e 100644
--- a/JudoPayDotNet/Models/RegisterCardModel.cs
+++ b/JudoPayDotNet/Models/RegisterCardModel.cs
@@ -114,6 +114,13 @@ public RegisterCardModel()
         [DataMember(EmitDefaultValue = false)]
         // ReSharper disable once UnusedMember.Global
         public JObject ClientDetails { get; set; }
+
+        /// <summary>
+        /// Details needed for MCC 6012 transactions
+        /// </summary>
+        [DataMember(EmitDefaultValue = false)]
+        // ReSharper disable once UnusedMember.Global
+        public PrimaryAccountDetailsModel PrimaryAccountDetails { get; set; }
     }
     // ReSharper restore UnusedMember.Global
 }
diff --git a/JudoPayDotNetIntegrationTests/CheckCardTests.cs b/JudoPayDotNetIntegrationTests/CheckCardTests.cs
index b5f962e..8b5adaa 100644
--- a/JudoPayDotNetIntegrationTests/CheckCardTests.cs
+++ b/JudoPayDotNetIntegrationTests/CheckCardTests.cs
@@ -82,6 +82,26 @@ public void ValidateWithoutSuccess(CheckCardModel checkCardModel, JudoModelError
             Assert.IsTrue(fieldErrors.Any(x => x.Code == (int)expectedModelErrorCode));
         }
 
+        [Test]
+        public async Task PrimaryAccountDetailsCheckCard()
+        {
+            var checkCardModel = GetCheckCardModel(Configuration.Cybersource_Judoid);
+            // Given a RegisterCardModel with PrimaryAccountDetails
+            checkCardModel.PrimaryAccountDetails = new PrimaryAccountDetailsModel
+            {
+                Name = "Doe",
+                AccountNumber = "1234567",
+                DateOfBirth = "2000-12-31",
+                PostCode = "EC2A 4DP"
+            };
+
+            var response = await JudoPayApiCyberSource.CheckCards.Create(checkCardModel);
+
+            Assert.IsNotNull(response);
+            Assert.IsFalse(response.HasError);
+            Assert.AreEqual("Success", response.Response.Result);
+        }
+
         internal class RegisterCheckCardTestSource
         {
             public static IEnumerable ValidateFailureTestCases
diff --git a/JudoPayDotNetIntegrationTests/RegisterCardTests.cs b/JudoPayDotNetIntegrationTests/RegisterCardTests.cs
index 35c7b7d..f615e46 100644
--- a/JudoPayDotNetIntegrationTests/RegisterCardTests.cs
+++ b/JudoPayDotNetIntegrationTests/RegisterCardTests.cs
@@ -93,5 +93,25 @@ public void ValidateWithoutSuccess(RegisterCardModel registerCardModel, JudoMode
             Assert.IsTrue(fieldErrors.Count >= 1);
             Assert.IsTrue(fieldErrors.Any(x => x.Code == (int)expectedModelErrorCode));
         }
+
+        [Test]
+        public async Task PrimaryAccountDetailsRegisterCard()
+        {
+            var registerCardModel = GetRegisterCardModel("432438862");
+            // Given a RegisterCardModel with PrimaryAccountDetails
+            registerCardModel.PrimaryAccountDetails = new PrimaryAccountDetailsModel
+            {
+                Name = "Doe",
+                AccountNumber = "1234567",
+                DateOfBirth = "2000-12-31",
+                PostCode = "EC2A 4DP"
+            };
+
+            var response = await JudoPayApiIridium.RegisterCards.Create(registerCardModel);
+
+            Assert.IsNotNull(response);
+            Assert.IsFalse(response.HasError);
+            Assert.AreEqual("Success", response.Response.Result);
+        }
     }
 }