diff --git a/.kokoro/secrets-example.sh b/.kokoro/secrets-example.sh
index 88710d0c69..287eb010cc 100644
--- a/.kokoro/secrets-example.sh
+++ b/.kokoro/secrets-example.sh
@@ -100,6 +100,10 @@ export REDIS_PORT=
 export GOOGLE_PUBSUB_SUBSCRIPTION=php-example-subscription
 export GOOGLE_PUBSUB_TOPIC=php-example-topic
 
+# Security Center
+export GOOGLE_ORGANIZATION_ID=
+export GOOGLE_SECURITYCENTER_PUBSUB_TOPIC=
+
 # Spanner
 export GOOGLE_SPANNER_INSTANCE_ID=
 export GOOGLE_SPANNER_DATABASE_ID=test-database
diff --git a/.kokoro/secrets.sh.enc b/.kokoro/secrets.sh.enc
index 0bb610715f..e966790143 100644
Binary files a/.kokoro/secrets.sh.enc and b/.kokoro/secrets.sh.enc differ
diff --git a/securitycenter/composer.json b/securitycenter/composer.json
new file mode 100644
index 0000000000..32fff1ac26
--- /dev/null
+++ b/securitycenter/composer.json
@@ -0,0 +1,6 @@
+{
+    "require": {
+        "google/cloud-security-center": "^0.5.0",
+        "google/cloud-pubsub": "^1.21"
+    }
+}
diff --git a/securitycenter/phpunit.xml.dist b/securitycenter/phpunit.xml.dist
new file mode 100644
index 0000000000..d59be6c31b
--- /dev/null
+++ b/securitycenter/phpunit.xml.dist
@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Copyright 2020 Google LLC.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+-->
+<phpunit backupGlobals="false"
+    backupStaticAttributes="false"
+    bootstrap="../testing/bootstrap.php"
+    colors="true"
+    processIsolation="false"
+    stopOnFailure="false"
+    timeoutForSmallTests="10"
+    timeoutForMediumTests="30"
+    timeoutForLargeTests="120">
+  <testsuites>
+    <testsuite name="PHP SecurityCenter tests">
+      <directory>test</directory>
+    </testsuite>
+  </testsuites>
+  <logging>
+    <log type="coverage-clover" target="./build/logs/clover.xml"/>
+  </logging>
+  <filter>
+    <whitelist addUncoveredFilesFromWhitelist="true">
+      <directory>./src</directory>
+      <exclude>
+        <directory>./vendor</directory>
+      </exclude>
+    </whitelist>
+  </filter>
+</phpunit>
diff --git a/securitycenter/src/create_notification.php b/securitycenter/src/create_notification.php
new file mode 100644
index 0000000000..26934a6989
--- /dev/null
+++ b/securitycenter/src/create_notification.php
@@ -0,0 +1,53 @@
+<?php
+/**
+ * Copyright 2020 Google LLC.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Include Google Cloud dependendencies using Composer
+require_once __DIR__ . '/../vendor/autoload.php';
+if (count($argv) < 4) {
+    return printf('Usage: php %s ORGANIZATION_ID NOTIFICATION_ID PROJECT_ID TOPIC_NAME\n', basename(__FILE__));
+}
+list($_, $organizationId, $notificationConfigId, $projectId, $topicName) = $argv;
+
+// [START scc_create_notification_config]
+use Google\Cloud\SecurityCenter\V1\SecurityCenterClient;
+use Google\Cloud\SecurityCenter\V1\NotificationConfig;
+use Google\Cloud\SecurityCenter\V1\NotificationConfig\StreamingConfig;
+
+/** Uncomment and populate these variables in your code */
+// $organizationId = "{your-org-id}";
+// $notificationConfigId = {"your-unique-id"};
+// $projectId = "{your-project}"";
+// $topicName = "{your-topic}";
+
+$securityCenterClient = new SecurityCenterClient();
+$organizationName = $securityCenterClient::organizationName($organizationId);
+$pubsubTopic = $securityCenterClient::topicName($projectId, $topicName);
+
+$streamingConfig = (new StreamingConfig())->setFilter("state = \"ACTIVE\"");
+$notificationConfig = (new NotificationConfig())
+    ->setDescription('A sample notification config')
+    ->setPubsubTopic($pubsubTopic)
+    ->setStreamingConfig($streamingConfig);
+
+$response = $securityCenterClient->createNotificationConfig(
+    $organizationName,
+    $notificationConfigId,
+    $notificationConfig
+);
+printf('Notification config was created: %s' . PHP_EOL, $response->getName());
+
+// [END scc_create_notification_config]
diff --git a/securitycenter/src/delete_notification.php b/securitycenter/src/delete_notification.php
new file mode 100644
index 0000000000..e318c2079e
--- /dev/null
+++ b/securitycenter/src/delete_notification.php
@@ -0,0 +1,41 @@
+<?php
+/**
+ * Copyright 2020 Google LLC.
+ *
+ * Licensed under the Apache License, Version 2.0 (the 'License');
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an 'AS IS' BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Include Google Cloud dependendencies using Composer
+require_once __DIR__ . '/../vendor/autoload.php';
+if (count($argv) < 2) {
+    return printf('Usage: php %s ORGANIZATION_ID NOTIFICATION_ID\n', basename(__FILE__));
+}
+list($_, $organizationId, $notificationConfigId) = $argv;
+
+// [START scc_delete_notification_config]
+use Google\Cloud\SecurityCenter\V1\SecurityCenterClient;
+
+/** Uncomment and populate these variables in your code */
+// $organizationId = '{your-org-id}';
+// $notificationConfigId = {'your-unique-id'};
+
+$securityCenterClient = new SecurityCenterClient();
+$notificationConfigName = $securityCenterClient::notificationConfigName(
+    $organizationId,
+    $notificationConfigId
+);
+
+$response = $securityCenterClient->deleteNotificationConfig($notificationConfigName);
+print('Notification config was deleted' . PHP_EOL);
+
+// [END scc_delete_notification_config]
diff --git a/securitycenter/src/get_notification.php b/securitycenter/src/get_notification.php
new file mode 100644
index 0000000000..4000761e77
--- /dev/null
+++ b/securitycenter/src/get_notification.php
@@ -0,0 +1,41 @@
+<?php
+/**
+ * Copyright 2020 Google LLC.
+ *
+ * Licensed under the Apache License, Version 2.0 (the 'License');
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an 'AS IS' BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Include Google Cloud dependendencies using Composer
+require_once __DIR__ . '/../vendor/autoload.php';
+if (count($argv) < 2) {
+    return printf('Usage: php %s ORGANIZATION_ID NOTIFICATION_ID\n', basename(__FILE__));
+}
+list($_, $organizationId, $notificationConfigId) = $argv;
+
+// [START scc_get_notification_config]
+use Google\Cloud\SecurityCenter\V1\SecurityCenterClient;
+
+/** Uncomment and populate these variables in your code */
+// $organizationId = '{your-org-id}';
+// $notificationConfigId = {'your-unique-id'};
+
+$securityCenterClient = new SecurityCenterClient();
+$notificationConfigName = $securityCenterClient::notificationConfigName(
+    $organizationId,
+    $notificationConfigId
+);
+
+$response = $securityCenterClient->getNotificationConfig($notificationConfigName);
+printf('Notification config was retrieved: %s' . PHP_EOL, $response->getName());
+
+// [END scc_get_notification_config]
diff --git a/securitycenter/src/list_notification.php b/securitycenter/src/list_notification.php
new file mode 100644
index 0000000000..b67e23ab5c
--- /dev/null
+++ b/securitycenter/src/list_notification.php
@@ -0,0 +1,40 @@
+<?php
+/**
+ * Copyright 2020 Google LLC.
+ *
+ * Licensed under the Apache License, Version 2.0 (the 'License');
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an 'AS IS' BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Include Google Cloud dependendencies using Composer
+require_once __DIR__ . '/../vendor/autoload.php';
+if (count($argv) < 1) {
+    return printf('Usage: php %s ORGANIZATION_ID\n', basename(__FILE__));
+}
+list($_, $organizationId) = $argv;
+
+// [START scc_list_notification_configs]
+use Google\Cloud\SecurityCenter\V1\SecurityCenterClient;
+
+/** Uncomment and populate these variables in your code */
+// $organizationId = '{your-org-id}';
+
+$securityCenterClient = new SecurityCenterClient();
+$organizationName = $securityCenterClient::organizationName($organizationId);
+
+foreach ($securityCenterClient->listNotificationConfigs($organizationName) as $element) {
+    printf('Found notification config %s' . PHP_EOL, $element->getName());
+}
+
+print('Notification configs were listed' . PHP_EOL);
+
+// [END scc_list_notification_configs]
diff --git a/securitycenter/src/receive_notification.php b/securitycenter/src/receive_notification.php
new file mode 100644
index 0000000000..ddb39bf785
--- /dev/null
+++ b/securitycenter/src/receive_notification.php
@@ -0,0 +1,43 @@
+<?php
+/**
+ * Copyright 2020 Google LLC.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Include Google Cloud dependendencies using Composer
+require_once __DIR__ . '/../vendor/autoload.php';
+if (count($argv) < 2) {
+    return printf('Usage: php %s PROJECT_ID SUSBSCRIPTION_ID\n', basename(__FILE__));
+}
+list($_, $projectId, $subscriptionId) = $argv;
+
+// [START scc_receive_notifications]
+use Google\Cloud\PubSub\PubSubClient;
+
+/** Uncomment and populate these variables in your code */
+// $projectId = "{your-project-id}";
+// $subscriptionId = "{your-subscription-id}";
+
+$pubsub = new PubSubClient([
+    'projectId' => $projectId,
+]);
+$subscription = $pubsub->subscription($subscriptionId);
+
+foreach ($subscription->pull() as $message) {
+    printf('Message: %s' . PHP_EOL, $message->data());
+    // Acknowledge the Pub/Sub message has been received, so it will not be pulled multiple times.
+    $subscription->acknowledge($message);
+}
+
+// [END scc_receive_notifications]
diff --git a/securitycenter/src/update_notification.php b/securitycenter/src/update_notification.php
new file mode 100644
index 0000000000..0711b0e4c5
--- /dev/null
+++ b/securitycenter/src/update_notification.php
@@ -0,0 +1,54 @@
+<?php
+/**
+ * Copyright 2020 Google LLC.
+ *
+ * Licensed under the Apache License, Version 2.0 (the 'License');
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an 'AS IS' BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Include Google Cloud dependendencies using Composer
+require_once __DIR__ . '/../vendor/autoload.php';
+if (count($argv) < 4) {
+    return printf('Usage: php %s ORGANIZATION_ID NOTIFICATION_ID PROJECT_ID TOPIC_NAME\n', basename(__FILE__));
+}
+list($_, $organizationId, $notificationConfigId, $projectId, $topicName) = $argv;
+
+// [START scc_update_notification_config]
+use Google\Cloud\SecurityCenter\V1\SecurityCenterClient;
+use Google\Cloud\SecurityCenter\V1\NotificationConfig;
+use Google\Cloud\SecurityCenter\V1\NotificationConfig\StreamingConfig;
+use Google\Protobuf\FieldMask;
+
+/** Uncomment and populate these variables in your code */
+// $organizationId = '{your-org-id}';
+// $notificationConfigId = {'your-unique-id'};
+// $projectId = '{your-project}';
+// $topicName = '{your-topic}';
+
+$securityCenterClient = new SecurityCenterClient();
+
+// Ensure this ServiceAccount has the 'pubsub.topics.setIamPolicy' permission on the topic.
+// https://cloud.google.com/pubsub/docs/reference/rest/v1/projects.topics/setIamPolicy
+$pubsubTopic = $securityCenterClient::topicName($projectId, $topicName);
+$notificationConfigName = $securityCenterClient::notificationConfigName($organizationId, $notificationConfigId);
+
+$streamingConfig = (new StreamingConfig())->setFilter("state = \"ACTIVE\"");
+$fieldMask = (new FieldMask())->setPaths(['description', 'pubsub_topic']);
+$notificationConfig = (new NotificationConfig())
+    ->setName($notificationConfigName)
+    ->setDescription('Updated description.')
+    ->setPubsubTopic($pubsubTopic);
+
+$response = $securityCenterClient->updateNotificationConfig($notificationConfig, [$fieldMask]);
+printf('Notification config was updated: %s' . PHP_EOL, $response->getName());
+
+// [END scc_update_notification_config]
diff --git a/securitycenter/test/SecurityCenterTest.php b/securitycenter/test/SecurityCenterTest.php
new file mode 100644
index 0000000000..d3828a394e
--- /dev/null
+++ b/securitycenter/test/SecurityCenterTest.php
@@ -0,0 +1,127 @@
+<?php
+/**
+ * Copyright 2020 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+use Google\Cloud\TestUtils\TestTrait;
+use PHPUnit\Framework\TestCase;
+
+class securityCenterTest extends TestCase
+{
+    use TestTrait;
+
+    private static $testNotificationCreate;
+    private static $testNotificationGet;
+    private static $testNotificationUpdate;
+
+    public static function setUpBeforeClass()
+    {
+        self::$testNotificationCreate = self::randomNotificationId();
+        self::$testNotificationGet = self::randomNotificationId();
+        self::$testNotificationUpdate = self::randomNotificationId();
+    }
+
+    private function deleteConfig(string $configId)
+    {
+        $deleteOutput = $this->runSnippet('delete_notification', [
+            self::getOrganizationId(),
+            $configId,
+        ]);
+
+        $this->assertContains('Notification config was deleted', $deleteOutput);
+    }
+
+    public function testCreateNotification()
+    {
+        $createOutput = $this->runSnippet('create_notification', [
+            self::getOrganizationId(),
+            self::$testNotificationCreate,
+            self::$projectId,
+            self::getTopicName()
+        ]);
+
+        $this->assertContains('Notification config was created', $createOutput);
+
+        self::deleteConfig(self::$testNotificationCreate);
+    }
+
+    public function testGetNotificationConfig()
+    {
+        $createOutput = $this->runSnippet('create_notification', [
+            self::getOrganizationId(),
+            self::$testNotificationGet,
+            self::$projectId,
+            self::getTopicName()
+        ]);
+
+        $this->assertContains('Notification config was created', $createOutput);
+
+        $getOutput = $this->runSnippet('get_notification', [
+            self::getOrganizationId(),
+            self::$testNotificationGet
+        ]);
+
+        $this->assertContains('Notification config was retrieved', $getOutput);
+
+        self::deleteConfig(self::$testNotificationGet);
+    }
+
+    public function testUpdateNotificationConfig()
+    {
+        $createOutput = $this->runSnippet('create_notification', [
+            self::getOrganizationId(),
+            self::$testNotificationUpdate,
+            self::$projectId,
+            self::getTopicName()
+        ]);
+
+        $this->assertContains('Notification config was created', $createOutput);
+
+        $getOutput = $this->runSnippet('update_notification', [
+            self::getOrganizationId(),
+            self::$testNotificationUpdate,
+            self::$projectId,
+            self::getTopicName()
+        ]);
+
+        $this->assertContains('Notification config was updated', $getOutput);
+
+        self::deleteConfig(self::$testNotificationUpdate);
+    }
+
+    public function testListNotificationConfig()
+    {
+        $listOutput = $this->runSnippet('list_notification', [
+            self::getOrganizationId(),
+        ]);
+
+        $this->assertContains('Notification configs were listed', $listOutput);
+    }
+
+    private static function getOrganizationId()
+    {
+        return self::requireEnv('GOOGLE_ORGANIZATION_ID');
+    }
+
+    private static function getTopicName()
+    {
+        return self::requireEnv('GOOGLE_SECURITYCENTER_PUBSUB_TOPIC');
+    }
+
+    private static function randomNotificationId()
+    {
+        return uniqid('php-notification-config-');
+    }
+}
diff --git a/spanner/test/spannerTest.php b/spanner/test/spannerTest.php
index d36f8f695a..fd166a9ecd 100644
--- a/spanner/test/spannerTest.php
+++ b/spanner/test/spannerTest.php
@@ -791,7 +791,6 @@ public static function tearDownAfterClass()
             if (strstr($db->name(), self::$databaseId) !== false) {
                 try {
                     $db->drop();
-
                 } catch (\Exception $e) {
                     $exceptions[] = $e;
                 }