diff --git a/iterableapi/src/main/java/com/iterable/iterableapi/IterableConfig.java b/iterableapi/src/main/java/com/iterable/iterableapi/IterableConfig.java
index d9e6b2542..3d392def0 100644
--- a/iterableapi/src/main/java/com/iterable/iterableapi/IterableConfig.java
+++ b/iterableapi/src/main/java/com/iterable/iterableapi/IterableConfig.java
@@ -146,6 +146,12 @@ public class IterableConfig {
      */
     final IterableInAppDisplayMode inAppDisplayMode;
 
+    /**
+     * Callback to allow the implementor to perform logic following a call to fetch
+     * unknown user creation criteria
+     */
+    final UnknownCriteriaReceivedCallback unknownCriteriaReceivedCallback;
+
     /**
      * Base URL for Webview content loading. Specifically used to enable CORS for external resources.
      * If null or empty, defaults to empty string (original behavior with about:blank origin).
@@ -190,6 +196,7 @@ private IterableConfig(Builder builder) {
         mobileFrameworkInfo = builder.mobileFrameworkInfo;
         webViewBaseUrl = builder.webViewBaseUrl;
         inAppDisplayMode = builder.inAppDisplayMode;
+        unknownCriteriaReceivedCallback = builder.unknownCriteriaReceivedCallback;
     }
 
     public static class Builder {
@@ -219,6 +226,7 @@ public static class Builder {
         private IterableUnknownUserHandler iterableUnknownUserHandler;
         private String webViewBaseUrl;
         private IterableInAppDisplayMode inAppDisplayMode = IterableInAppDisplayMode.FORCE_EDGE_TO_EDGE;
+        private UnknownCriteriaReceivedCallback unknownCriteriaReceivedCallback;
 
         public Builder() {}
 
@@ -461,6 +469,15 @@ public Builder setMobileFrameworkInfo(@NonNull IterableAPIMobileFrameworkInfo mo
             return this;
         }
 
+        /**
+         * Set a callback to signal completion of api calls to fetch criteria for unknown user creation.
+         * @param unknownCriteriaReceivedCallback Listener for unknown criteria api calls provided by the app
+         */
+        public Builder setUnknownCriteriaResultCallback(UnknownCriteriaReceivedCallback unknownCriteriaReceivedCallback) {
+            this.unknownCriteriaReceivedCallback = unknownCriteriaReceivedCallback;
+            return this;
+        }
+
         /**
          * Set how in-app messages interact with the system bars (status bar, navigation bar).
          * Defaults to {@link IterableInAppDisplayMode#FORCE_EDGE_TO_EDGE}, which preserves existing behavior.
diff --git a/iterableapi/src/main/java/com/iterable/iterableapi/UnknownCriteriaReceivedCallback.kt b/iterableapi/src/main/java/com/iterable/iterableapi/UnknownCriteriaReceivedCallback.kt
new file mode 100644
index 000000000..7d0d9d652
--- /dev/null
+++ b/iterableapi/src/main/java/com/iterable/iterableapi/UnknownCriteriaReceivedCallback.kt
@@ -0,0 +1,5 @@
+package com.iterable.iterableapi
+
+interface UnknownCriteriaReceivedCallback {
+    fun criteriaReceived()
+}
\ No newline at end of file
diff --git a/iterableapi/src/main/java/com/iterable/iterableapi/UnknownUserManager.java b/iterableapi/src/main/java/com/iterable/iterableapi/UnknownUserManager.java
index a6ee48d45..4da40ce58 100644
--- a/iterableapi/src/main/java/com/iterable/iterableapi/UnknownUserManager.java
+++ b/iterableapi/src/main/java/com/iterable/iterableapi/UnknownUserManager.java
@@ -181,7 +181,9 @@ void getUnknownCriteria() {
                     SharedPreferences.Editor editor = sharedPref.edit();
                     editor.putString(IterableConstants.SHARED_PREFS_CRITERIA, mockDataObject.toString());
                     editor.apply();
-
+                    if (IterableApi.getInstance().config.unknownCriteriaReceivedCallback != null) {
+                        IterableApi.getInstance().config.unknownCriteriaReceivedCallback.criteriaReceived();
+                    }
                 } catch (JSONException e) {
                     e.printStackTrace();
                 }