From 6ef87b5ff48276547517b264308562b157cb3c22 Mon Sep 17 00:00:00 2001
From: sydneycollins-cio <149523950+sydneycollins-cio@users.noreply.github.com>
Date: Mon, 26 Oct 2026 14:53:09 -0400
Subject: [PATCH 1/2] feat(MBL-2652): make inApp.siteId optional with a pk_ key

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 README.md                                             |  2 +-
 .../sdk/messaginginapp/NativeMessagingInAppModule.kt  | 11 ++++++-----
 api-extractor-output/customerio-reactnative.api.md    |  2 +-
 src/types/data-pipelines.ts                           |  6 +++++-
 4 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/README.md b/README.md
index fe4226a3..df9ec001 100644
--- a/README.md
+++ b/README.md
@@ -78,7 +78,7 @@ useEffect(() => {
     logLevel: CioLogLevel.debug,
     trackApplicationLifecycleEvents: true,
     inApp: {
-      siteId: 'your-site-id', // Required for in-app messaging
+      siteId: 'your-site-id', // Optional with a pk_ key
     },
     push: {
       android: {
diff --git a/android/src/main/java/io/customer/reactnative/sdk/messaginginapp/NativeMessagingInAppModule.kt b/android/src/main/java/io/customer/reactnative/sdk/messaginginapp/NativeMessagingInAppModule.kt
index 40a130e1..79cc28ec 100644
--- a/android/src/main/java/io/customer/reactnative/sdk/messaginginapp/NativeMessagingInAppModule.kt
+++ b/android/src/main/java/io/customer/reactnative/sdk/messaginginapp/NativeMessagingInAppModule.kt
@@ -265,15 +265,16 @@ class NativeMessagingInAppModule(
             builder: CustomerIOBuilder,
             config: Map<String, Any>
         ) {
-            // Site ID is still required. Native in-app reads the key and region from the CustomerIO setup.
+            // Site ID is optional with a public (pk_) key. Native in-app reads the key and region from the CustomerIO setup.
             val siteId = config.getTypedValue<String>(Keys.Config.SITE_ID)
-            if (siteId.isNullOrBlank()) {
-                SDKComponent.logger.error("Site ID is required to initialize InAppMessaging module")
-                return
+            val configBuilder = if (siteId.isNullOrBlank()) {
+                MessagingInAppModuleConfig.Builder()
+            } else {
+                MessagingInAppModuleConfig.Builder(siteId = siteId)
             }
 
             val module = ModuleMessagingInApp(
-                MessagingInAppModuleConfig.Builder(siteId = siteId).apply {
+                configBuilder.apply {
                     setEventListener(eventListener = ReactInAppEventListener.instance)
                     colorSchemeFromConfig(config)?.let { colorScheme ->
                         setColorScheme(colorScheme)
diff --git a/api-extractor-output/customerio-reactnative.api.md b/api-extractor-output/customerio-reactnative.api.md
index b8c754fd..feee2218 100644
--- a/api-extractor-output/customerio-reactnative.api.md
+++ b/api-extractor-output/customerio-reactnative.api.md
@@ -36,7 +36,7 @@ export type CioConfig = {
     trackApplicationLifecycleEvents?: boolean;
     autoTrackDeviceAttributes?: boolean;
     inApp?: {
-        siteId: string;
+        siteId?: string;
         colorScheme?: CioColorScheme;
         notificationInboxAccessibilityLabels?: NotificationInboxAccessibilityLabels;
     };
diff --git a/src/types/data-pipelines.ts b/src/types/data-pipelines.ts
index 921cb9ae..bf43b141 100644
--- a/src/types/data-pipelines.ts
+++ b/src/types/data-pipelines.ts
@@ -68,7 +68,11 @@ export type CioConfig = {
   trackApplicationLifecycleEvents?: boolean;
   autoTrackDeviceAttributes?: boolean;
   inApp?: {
-    siteId: string;
+    /**
+     * Workspace site ID. Optional when `cdpApiKey` is a public `pk_` key, which identifies the
+     * workspace. Pass `inApp: {}` to turn on in-app messaging without one.
+     */
+    siteId?: string;
     /**
      * Color scheme used to render in-app messages. Defaults to `CioColorScheme.Auto`, which
      * follows the device appearance. Set it when the app has its own appearance setting that

From 8ef8eecd5acbe1342d390508581a9bb307af86fc Mon Sep 17 00:00:00 2001
From: sydneycollins-cio <149523950+sydneycollins-cio@users.noreply.github.com>
Date: Tue, 27 Oct 2026 12:40:17 -0400
Subject: [PATCH 2/2] feat(MBL-2652): take native iOS 5.1.0 so inApp works
 without siteId on iOS

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 __tests__/in-app-site-id.test.ts | 21 +++++++++++++++++++--
 package.json                     |  2 +-
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/__tests__/in-app-site-id.test.ts b/__tests__/in-app-site-id.test.ts
index 83371627..5d8a5057 100644
--- a/__tests__/in-app-site-id.test.ts
+++ b/__tests__/in-app-site-id.test.ts
@@ -1,6 +1,6 @@
 /**
- * `inApp.siteId` stays required, even with a workspace public (`pk_`) key, until the native SDKs
- * and the in-app renderer support key-only setup. The JavaScript layer forwards the config as given.
+ * `inApp.siteId` is optional with a workspace public (`pk_`) key. The JavaScript layer forwards the
+ * config as given, and the native SDKs start in-app without a site ID when it is left out.
  */
 
 jest.mock('react-native', () => ({
@@ -56,4 +56,21 @@ describe('in-app site ID', () => {
       expect.anything()
     );
   });
+
+  it('forwards an empty inApp config with a pk_ key', async () => {
+    const config: CioConfig = {
+      cdpApiKey: 'pk_eu_test-key',
+      inApp: {},
+    };
+
+    await CustomerIO.initialize(config);
+
+    expect(nativeInitialize).toHaveBeenCalledWith(
+      expect.objectContaining({
+        cdpApiKey: 'pk_eu_test-key',
+        inApp: {},
+      }),
+      expect.anything()
+    );
+  });
 });
diff --git a/package.json b/package.json
index 7eabb5c4..ec458e07 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     },
     "./package.json": "./package.json"
   },
-  "cioNativeiOSSdkVersion": "= 5.0.0",
+  "cioNativeiOSSdkVersion": "= 5.1.0",
   "files": [
     "src",
     "lib",