diff --git a/src/applications/differential/xaction/DifferentialRevisionHoldDraftTransaction.php b/src/applications/differential/xaction/DifferentialRevisionHoldDraftTransaction.php
--- a/src/applications/differential/xaction/DifferentialRevisionHoldDraftTransaction.php
+++ b/src/applications/differential/xaction/DifferentialRevisionHoldDraftTransaction.php
@@ -55,4 +55,15 @@
     }
   }
 
+  public function getTransactionTypeForConduit($xaction) {
+    return 'draft';
+  }
+
+  public function getFieldValuesForConduit($xaction, $data) {
+    return array(
+      'old' => $xaction->getOldValue(),
+      'new' => $xaction->getNewValue(),
+    );
+  }
+
 }
diff --git a/src/applications/differential/xaction/DifferentialRevisionSummaryTransaction.php b/src/applications/differential/xaction/DifferentialRevisionSummaryTransaction.php
--- a/src/applications/differential/xaction/DifferentialRevisionSummaryTransaction.php
+++ b/src/applications/differential/xaction/DifferentialRevisionSummaryTransaction.php
@@ -61,4 +61,15 @@
       pht('Summary'));
   }
 
+  public function getTransactionTypeForConduit($xaction) {
+    return 'summary';
+  }
+
+  public function getFieldValuesForConduit($xaction, $data) {
+    return array(
+      'old' => $xaction->getOldValue(),
+      'new' => $xaction->getNewValue(),
+    );
+  }
+
 }
diff --git a/src/applications/differential/xaction/DifferentialRevisionTestPlanTransaction.php b/src/applications/differential/xaction/DifferentialRevisionTestPlanTransaction.php
--- a/src/applications/differential/xaction/DifferentialRevisionTestPlanTransaction.php
+++ b/src/applications/differential/xaction/DifferentialRevisionTestPlanTransaction.php
@@ -75,4 +75,15 @@
     return $errors;
   }
 
+  public function getTransactionTypeForConduit($xaction) {
+    return 'testPlan';
+  }
+
+  public function getFieldValuesForConduit($xaction, $data) {
+    return array(
+      'old' => $xaction->getOldValue(),
+      'new' => $xaction->getNewValue(),
+    );
+  }
+
 }
diff --git a/src/applications/differential/xaction/DifferentialRevisionTitleTransaction.php b/src/applications/differential/xaction/DifferentialRevisionTitleTransaction.php
--- a/src/applications/differential/xaction/DifferentialRevisionTitleTransaction.php
+++ b/src/applications/differential/xaction/DifferentialRevisionTitleTransaction.php
@@ -59,10 +59,10 @@
     return 'title';
   }
 
-  public function getFieldValuesForConduit($object, $data) {
+  public function getFieldValuesForConduit($xaction, $data) {
     return array(
-      'old' => $object->getOldValue(),
-      'new' => $object->getNewValue(),
+      'old' => $xaction->getOldValue(),
+      'new' => $xaction->getNewValue(),
     );
   }
 
diff --git a/src/applications/differential/xaction/DifferentialRevisionUpdateTransaction.php b/src/applications/differential/xaction/DifferentialRevisionUpdateTransaction.php
--- a/src/applications/differential/xaction/DifferentialRevisionUpdateTransaction.php
+++ b/src/applications/differential/xaction/DifferentialRevisionUpdateTransaction.php
@@ -225,12 +225,12 @@
     return 'update';
   }
 
-  public function getFieldValuesForConduit($object, $data) {
-    $commit_phids = $object->getMetadataValue('commitPHIDs', array());
+  public function getFieldValuesForConduit($xaction, $data) {
+    $commit_phids = $xaction->getMetadataValue('commitPHIDs', array());
 
     return array(
-      'old' => $object->getOldValue(),
-      'new' => $object->getNewValue(),
+      'old' => $xaction->getOldValue(),
+      'new' => $xaction->getNewValue(),
       'commitPHIDs' => $commit_phids,
     );
   }