diff --git a/java/google/registry/flows/custom/DomainCreateFlowCustomLogic.java b/java/google/registry/flows/custom/DomainCreateFlowCustomLogic.java
index e0a841379..d547c84cf 100644
--- a/java/google/registry/flows/custom/DomainCreateFlowCustomLogic.java
+++ b/java/google/registry/flows/custom/DomainCreateFlowCustomLogic.java
@@ -15,6 +15,7 @@
 package google.registry.flows.custom;
 
 import com.google.auto.value.AutoValue;
+import com.google.common.base.Optional;
 import com.google.common.collect.ImmutableList;
 import com.google.common.net.InternetDomainName;
 import google.registry.flows.EppException;
@@ -92,6 +93,13 @@ public class DomainCreateFlowCustomLogic extends BaseFlowCustomLogic {
      */
     public abstract int years();
 
+    /**
+     * The ID of the validated signed mark.
+     *
+     * <p>If a signed mark was not supplied, this value will be absent.
+     */
+    public abstract Optional<String> signedMarkId();
+
     public static Builder newBuilder() {
       return new AutoValue_DomainCreateFlowCustomLogic_AfterValidationParameters.Builder();
     }
@@ -104,6 +112,8 @@ public class DomainCreateFlowCustomLogic extends BaseFlowCustomLogic {
 
       public abstract Builder setYears(int years);
 
+      public abstract Builder setSignedMarkId(Optional<String> signedMarkId);
+
       public abstract AfterValidationParameters build();
     }
   }
diff --git a/java/google/registry/flows/domain/DomainCreateFlow.java b/java/google/registry/flows/domain/DomainCreateFlow.java
index 0d9723751..76680ce17 100644
--- a/java/google/registry/flows/domain/DomainCreateFlow.java
+++ b/java/google/registry/flows/domain/DomainCreateFlow.java
@@ -42,6 +42,7 @@ import static google.registry.model.registry.label.ReservedList.matchesAnchorTen
 import static google.registry.util.DateTimeUtils.END_OF_TIME;
 import static google.registry.util.DateTimeUtils.leapSafeAddYears;
 
+import com.google.common.base.Optional;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Sets;
@@ -230,6 +231,7 @@ public class DomainCreateFlow implements TransactionalFlow {
         DomainCreateFlowCustomLogic.AfterValidationParameters.newBuilder()
             .setDomainName(domainName)
             .setYears(years)
+            .setSignedMarkId(Optional.fromNullable(signedMarkId))
             .build());
     FeeCreateCommandExtension feeCreate =
         eppInput.getSingleExtension(FeeCreateCommandExtension.class);