diff --git a/iterable-extension/src/main/java/com/mparticle/ext/iterable/IterableExtension.java b/iterable-extension/src/main/java/com/mparticle/ext/iterable/IterableExtension.java
index 1e93667..88d0953 100644
--- a/iterable-extension/src/main/java/com/mparticle/ext/iterable/IterableExtension.java
+++ b/iterable-extension/src/main/java/com/mparticle/ext/iterable/IterableExtension.java
@@ -33,6 +33,7 @@ public class IterableExtension extends MessageProcessor {
     public static final String MPARTICLE_RESERVED_PHONE_ATTR = "$Mobile";
     public static final String ITERABLE_RESERVED_PHONE_ATTR = "phoneNumber";
     public static final Set<Integer> RETRIABLE_HTTP_STATUS_SET = new HashSet<>(Arrays.asList(429, 502, 504));
+    public static final long API_KEY_LENGTH = 32;
     static final ObjectMapper mapper = new ObjectMapper();
     IterableService iterableService = IterableService.newInstance();
     IterableExtensionLogger logger;
@@ -107,19 +108,24 @@ private void processPushOpens(EventProcessingRequest processingRequest) throws I
         }
     }
 
-    private static String getApiKey(Event event) {
-        Account account = event.getRequest().getAccount();
-        return account.getStringSetting(SETTING_API_KEY, true, null);
+    private static String getApiKey(Event event) throws IOException {
+        return getApiKeyOrThrow(event.getRequest().getAccount());
     }
 
-    private static String getApiKey(EventProcessingRequest event) {
-        Account account = event.getAccount();
-        return account.getStringSetting(SETTING_API_KEY, true, null);
+    private static String getApiKey(EventProcessingRequest event) throws IOException {
+        return getApiKeyOrThrow(event.getAccount());
     }
 
-    private static String getApiKey(AudienceMembershipChangeRequest event) {
-        Account account = event.getAccount();
-        return account.getStringSetting(SETTING_API_KEY, true, null);
+    private static String getApiKey(AudienceMembershipChangeRequest event) throws IOException {
+        return getApiKeyOrThrow(event.getAccount());
+    }
+
+    private static String getApiKeyOrThrow(Account account) throws IOException {
+        String apiKey = account.getStringSetting(SETTING_API_KEY, true, null);
+        if (apiKey.length() != API_KEY_LENGTH) {
+            throw new ProcessingError("Invalid API key, length is " + apiKey.length());
+        }
+        return apiKey;
     }
 
     /**
@@ -157,6 +163,9 @@ public void processPushSubscriptionEvent(PushSubscriptionEvent event) throws IOE
         if (event.getRequest().getRuntimeEnvironment().getType().equals(RuntimeEnvironment.Type.IOS)) {
             Boolean sandboxed = ((IosRuntimeEnvironment) event.getRequest().getRuntimeEnvironment()).getIsSandboxed();
             if (sandboxed != null && sandboxed) {
+                // TODO: Replace isSandboxed with isDebug
+                String keyIdentifier = getApiKey(event).substring(getApiKey(event).length() - 8);
+                logger.logMessage("Key identifier for sandbox registrant: " + keyIdentifier);
                 request.device.platform = Device.PLATFORM_APNS_SANDBOX;
                 request.device.applicationName = event.getRequest().getAccount().getAccountSettings().get(SETTING_APNS_SANDBOX_KEY);
             } else {
@@ -264,6 +273,9 @@ void updateUser(EventProcessingRequest request) throws IOException {
     private Map<String, List<Object>> processUserAttributesList(Map<String, List<String>> userAttributesList, boolean shouldCoerceStrings) {
         Map<String, List<Object>> convertedAttributeList = new HashMap<>();
         userAttributesList.forEach((key, value)-> {
+            if (value == null) {
+                return;
+            }
             List<Object> convertedAttributes = convertedAttributeList.get(key);
             if (convertedAttributes == null) {
                 convertedAttributes = new ArrayList<>();
diff --git a/iterable-extension/src/test/java/com/mparticle/ext/iterable/IterableExtensionTest.java b/iterable-extension/src/test/java/com/mparticle/ext/iterable/IterableExtensionTest.java
index 619fc2e..f55beb4 100644
--- a/iterable-extension/src/test/java/com/mparticle/ext/iterable/IterableExtensionTest.java
+++ b/iterable-extension/src/test/java/com/mparticle/ext/iterable/IterableExtensionTest.java
@@ -29,7 +29,7 @@
 import static org.mockito.Mockito.times;
 
 public class IterableExtensionTest {
-    private static final String TEST_API_KEY = "foo api key";
+    private static final String TEST_API_KEY = "7982f56948624d8dc2f53ff007f51de3";
     private IterableExtension testExtension;
     private IterableExtensionLogger testLogger;
     private IterableService iterableServiceMock;
@@ -91,7 +91,7 @@ public void setup() {
 
         testAccount = new Account();
         Map<String, String> accountSettings = new HashMap<>();
-        accountSettings.put(SETTING_API_KEY, "some api key");
+        accountSettings.put(SETTING_API_KEY, "7982f56948624d8dc2f53ff007f51de3");
         testAccount.setAccountSettings(accountSettings);
 
         testIterableApiSuccess = new IterableApiResponse();
@@ -552,7 +552,7 @@ public void testProcessAudienceMembershipChangeRequest() throws Exception {
         AudienceMembershipChangeRequest request = new AudienceMembershipChangeRequest();
         Account account = new Account();
         Map<String, String> settings = new HashMap<>();
-        settings.put(SETTING_API_KEY, "some api key");
+        settings.put(SETTING_API_KEY, "7982f56948624d8dc2f53ff007f51de3");
         account.setAccountSettings(settings);
         request.setAccount(account);
         request.setUserProfiles(profiles);
@@ -563,7 +563,7 @@ public void testProcessAudienceMembershipChangeRequest() throws Exception {
         ArgumentCaptor<String> apiArgument = ArgumentCaptor.forClass(String.class);
         Mockito.verify(service, Mockito.times(3)).listSubscribe(apiArgument.capture(), argument.capture());
         String apiKey = apiArgument.getValue();
-        assertEquals("some api key", apiKey);
+        assertEquals("7982f56948624d8dc2f53ff007f51de3", apiKey);
         List<SubscribeRequest> subscribeRequests = argument.getAllValues();
         int i = 0;
         for (SubscribeRequest subscribeRequest : subscribeRequests) {
@@ -721,6 +721,45 @@ public void testConvertToCommerceItem() throws Exception {
 
     }
 
+    @Test
+    public void testProcessPushSubscriptionEvent() throws Exception {
+        EventProcessingRequest request = createEventProcessingRequest(true);
+        String fakeToken = "bdcbbb717ed20a9bad33e63dec3703210abf085dd73362589c92e61697ca1234";
+        PushSubscriptionEvent event = new PushSubscriptionEvent();
+        event.setToken(fakeToken);
+
+        Account account = new Account();
+        HashMap<String, String> settings = new HashMap<String, String>();
+        settings.put(SETTING_APNS_KEY, "iterable.app");
+        settings.put(SETTING_API_KEY, TEST_API_KEY);
+        account.setAccountSettings(settings);
+        request.setAccount(account);
+
+        List<UserIdentity> userIdentities = new LinkedList<>();
+        userIdentities.add(new UserIdentity(UserIdentity.Type.EMAIL, Identity.Encoding.RAW, "mptest@mparticle.com"));
+        userIdentities.add(new UserIdentity(UserIdentity.Type.CUSTOMER, Identity.Encoding.RAW, "123456"));
+        request.setUserIdentities(userIdentities);
+        request.setRuntimeEnvironment(new IosRuntimeEnvironment());
+        event.setRequest(request);
+
+        testExtension.iterableService = Mockito.mock(IterableService.class);
+        Call callMock = Mockito.mock(Call.class);
+        Mockito.when(testExtension.iterableService.registerToken(Mockito.any(), Mockito.any())).thenReturn(callMock);
+
+        IterableApiResponse apiResponse = new IterableApiResponse();
+        apiResponse.code = IterableApiResponse.SUCCESS_MESSAGE;
+        Response<IterableApiResponse> response = Response.success(apiResponse);
+        Mockito.when(callMock.execute()).thenReturn(response);
+
+        testExtension.processPushSubscriptionEvent(event);
+        ArgumentCaptor<RegisterDeviceTokenRequest> pushRegisterArgs = ArgumentCaptor.forClass(RegisterDeviceTokenRequest.class);
+        Mockito.verify(testExtension.iterableService, Mockito.times(1)).registerToken(Mockito.any(), pushRegisterArgs.capture());
+        RegisterDeviceTokenRequest registerTokenRequest = pushRegisterArgs.getValue();
+        assertEquals("iterable.app", registerTokenRequest.device.applicationName);
+        assertEquals(fakeToken, registerTokenRequest.device.token);
+        assertEquals("mptest@mparticle.com", registerTokenRequest.email);
+    }
+
     @Test
     public void testProcessProductActionEvent() throws Exception {
         ProductActionEvent event = new ProductActionEvent();
@@ -945,7 +984,7 @@ public void testUpdateSubscriptionsEvent() throws Exception {
         event.setName(IterableExtension.UPDATE_SUBSCRIPTIONS_CUSTOM_EVENT_NAME);
         EventProcessingRequest request = createEventProcessingRequest();
         Map<String, String> settings = request.getAccount().getAccountSettings();
-        settings.put(SETTING_API_KEY, "foo api key 2");
+        settings.put(SETTING_API_KEY, "7982f56948624d8dc2f53ff007f51de3");
         List<UserIdentity> userIdentities = new LinkedList<>();
         userIdentities.add(new UserIdentity(UserIdentity.Type.EMAIL, Identity.Encoding.RAW, "mptest@mparticle.com"));
         request.setUserIdentities(userIdentities);
@@ -969,7 +1008,7 @@ public void testUpdateSubscriptionsEvent() throws Exception {
         ArgumentCaptor<UpdateSubscriptionsRequest> argument = ArgumentCaptor.forClass(UpdateSubscriptionsRequest.class);
         ArgumentCaptor<String> stringArgumentCaptor = ArgumentCaptor.forClass(String.class);
         Mockito.verify(testExtension.iterableService).updateSubscriptions(stringArgumentCaptor.capture(), argument.capture());
-        assertEquals("foo api key 2", stringArgumentCaptor.getValue());
+        assertEquals("7982f56948624d8dc2f53ff007f51de3", stringArgumentCaptor.getValue());
         assertEquals("mptest@mparticle.com", argument.getValue().email);
         assertEquals(expectedEmailListIdList, argument.getValue().emailListIds);
         assertEquals(expectedChannelIdList, argument.getValue().unsubscribedChannelIds);
diff --git a/iterable-ingress-extension/src/test/java/com/mparticle/ext/iterable/IngressExtensionTest.java b/iterable-ingress-extension/src/test/java/com/mparticle/ext/iterable/IngressExtensionTest.java
index fb40bc8..741f0af 100644
--- a/iterable-ingress-extension/src/test/java/com/mparticle/ext/iterable/IngressExtensionTest.java
+++ b/iterable-ingress-extension/src/test/java/com/mparticle/ext/iterable/IngressExtensionTest.java
@@ -19,7 +19,7 @@
 
 public class IngressExtensionTest {
 
-  private static final String TEST_API_KEY = "foo api key";
+  private static final String TEST_API_KEY = "7982f56948624d8dc2f53ff007f51de3";
   private static MessageSerializer serializer;
   private static IngressExtension ingressExtension;