diff --git a/common/src/main/java/com/netflix/conductor/common/metadata/workflow/SubWorkflowParams.java b/common/src/main/java/com/netflix/conductor/common/metadata/workflow/SubWorkflowParams.java
index 1006b37687..8c18156d7e 100644
--- a/common/src/main/java/com/netflix/conductor/common/metadata/workflow/SubWorkflowParams.java
+++ b/common/src/main/java/com/netflix/conductor/common/metadata/workflow/SubWorkflowParams.java
@@ -41,6 +41,26 @@ public class SubWorkflowParams {
     @ProtoField(id = 4)
     private Object workflowDefinition;
 
+    private String idempotencyKey;
+
+    private IdempotencyStrategy idempotencyStrategy;
+
+    public String getIdempotencyKey() {
+        return idempotencyKey;
+    }
+
+    public void setIdempotencyKey(String idempotencyKey) {
+        this.idempotencyKey = idempotencyKey;
+    }
+
+    public IdempotencyStrategy getIdempotencyStrategy() {
+        return idempotencyStrategy;
+    }
+
+    public void setIdempotencyStrategy(IdempotencyStrategy idempotencyStrategy) {
+        this.idempotencyStrategy = idempotencyStrategy;
+    }
+
     /**
      * @return the name
      */
diff --git a/core/src/main/java/com/netflix/conductor/core/execution/WorkflowExecutor.java b/core/src/main/java/com/netflix/conductor/core/execution/WorkflowExecutor.java
index 8e090f453f..16d7668e56 100644
--- a/core/src/main/java/com/netflix/conductor/core/execution/WorkflowExecutor.java
+++ b/core/src/main/java/com/netflix/conductor/core/execution/WorkflowExecutor.java
@@ -2155,4 +2155,37 @@ public WorkflowModel jumpWorkflowExecutionToTask(
 
     public void upgradeRunningWorkflowToVersion(
             String workflowId, UpgradeWorkflowRequest upgradeWorkflowRequest) {}
+
+    public String startWorkflow(
+            String name,
+            Integer version,
+            Map<String, Object> workflowInput,
+            String externalInputPayloadStoragePath,
+            String correlationId,
+            Integer priority,
+            String parentWorkflowId,
+            String parentWorkflowTaskId,
+            String event,
+            Map<String, String> taskToDomain,
+            String createdBy,
+            String idempotencyKey,
+            IdempotencyStrategy idempotencyStrategy) {
+        return null;
+    }
+
+    public String startWorkflow(
+            WorkflowDef workflowDefinition,
+            Map<String, Object> workflowInput,
+            String externalInputPayloadStoragePath,
+            String correlationId,
+            Integer priority,
+            String parentWorkflowId,
+            String parentWorkflowTaskId,
+            String event,
+            Map<String, String> taskToDomain,
+            String createdBy,
+            String idempotencyKey,
+            IdempotencyStrategy idempotencyStrategy) {
+        return null;
+    }
 }