diff --git a/.travis.yml b/.travis.yml
index 1b085f9..3d1aacc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,23 +18,18 @@ cache:
 php:
   - 7.0
   - 7.1
-  - 7.2
 
 env:
   - DB=pgsql  MOODLE_BRANCH=MOODLE_33_STABLE
   - DB=mysqli MOODLE_BRANCH=MOODLE_33_STABLE
-  - DB=mysqli MOODLE_BRANCH=MOODLE_34_STABLE
-  - DB=mysqli MOODLE_BRANCH=master
 
 matrix:
   include:
     - php: 5.6
-      env: DB=mysqli MOODLE_BRANCH=MOODLE_33_STABLE # Moodle 3.4+ requires 7.0.0
+      env: DB=mysqli MOODLE_BRANCH=MOODLE_33_STABLE # Moodle 3.3 is still compatible with PHP 5.6
   exclude:
-    - php: 7.2
+    - php: 7.1
       env: DB=mysqli MOODLE_BRANCH=MOODLE_33_STABLE
-    - php: 7.2
-      env: DB=pgsql  MOODLE_BRANCH=MOODLE_33_STABLE
 
 before_install:
   - phpenv config-rm xdebug.ini
diff --git a/CHANGES.md b/CHANGES.md
index daf634a..36e3121 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,8 @@
+# v1.3.0.0 (Build: 2018040900)
+Starting from this versione the minor number indicates the supported Moodle version:
+_x.3.y.z_ means that this version supports Moodle 3.3 but not 3.4+.
+- Implemented the Moodle Privacy API
+
 # v1.0.4 (Build: 2017121000)
 - Fixed an error when the course summary is not provided.
 
diff --git a/classes/privacy/provider.php b/classes/privacy/provider.php
new file mode 100644
index 0000000..3113e45
--- /dev/null
+++ b/classes/privacy/provider.php
@@ -0,0 +1,54 @@
+<?php
+// This file is part of the Twitter Card local plugin for Moodle
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Privacy Subsystem implementation for local_twittercard.
+ *
+ * @package    local_twittercard
+ * @copyright  2018 Matteo Scaramuccia <moodle@matteoscaramuccia.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace local_twittercard\privacy;
+
+defined('MOODLE_INTERNAL') || die();
+
+// Backward compat.
+interface_exists('\core_privacy\local\metadata\null_provider') || die();
+
+// 3.3 runs even on PHP 5.6 so 'return type declaration' is not supported:
+// the privacy null_provider interface has been implemented in 3.3 accordingly.
+
+/**
+ * Privacy Subsystem implementation for local_twittercard implementing null_provider.
+ *
+ * @package    local_twittercard
+ * @copyright  2018 Matteo Scaramuccia <moodle@matteoscaramuccia.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class provider implements
+    // This plugin does not store any personal user data.
+    \core_privacy\local\metadata\null_provider {
+    /**
+     * Get the language string identifier with the component's language
+     * file to explain why this plugin stores no data.
+     *
+     * @return  string
+     */
+    public static function get_reason() {
+        return 'privacy:metadata';
+    }
+}
diff --git a/lang/en/local_twittercard.php b/lang/en/local_twittercard.php
index 154c033..32e17c4 100644
--- a/lang/en/local_twittercard.php
+++ b/lang/en/local_twittercard.php
@@ -30,6 +30,7 @@
 $string['enabled'] = 'Enabled';
 $string['enabled_help'] = 'Enable a Twitter summary card for courses.';
 $string['pluginname'] = 'Twitter card';
+$string['privacy:metadata'] = 'The Twitter Card local plugin displays information from the Course, but does not effect or store any data itself.';
 $string['twittercard'] = 'Twitter card';
 $string['twittersite'] = 'Twitter site';
 $string['twittersite_help'] = 'The Twitter @username of website the card should be attributed to.';
diff --git a/tests/privacy_test.php b/tests/privacy_test.php
new file mode 100644
index 0000000..ba80e20
--- /dev/null
+++ b/tests/privacy_test.php
@@ -0,0 +1,49 @@
+<?php
+// This file is part of the Twitter Card local plugin for Moodle
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Tests for the Privacy API implementation in Twitter summary card.
+ *
+ * @package    local_twittercard
+ * @copyright  2018 Matteo Scaramuccia <moodle@matteoscaramuccia.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * Class local_twittercard_privacy_testcase
+ *
+ * @package    local_twittercard
+ * @copyright  2017 Matteo Scaramuccia <moodle@matteoscaramuccia.com>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class local_twittercard_privacy_testcase extends advanced_testcase {
+    /**
+     * Tests that local_twittercard actually implements the Privacy API null_provider.
+     */
+    public function test_null_provider() {
+        if (!interface_exists('\core_privacy\local\metadata\null_provider')) {
+            $this->markTestSkipped('The Moodle code does not implement the Moodle Privacy API');
+        }
+
+        $this->assertTrue(class_exists('\local_twittercard\privacy\provider'));
+        $this->assertEquals(
+            [ 'core_privacy\local\metadata\null_provider' => 'core_privacy\local\metadata\null_provider' ],
+            class_implements('\local_twittercard\privacy\provider')
+        );
+    }
+}
diff --git a/version.php b/version.php
index 3122ca5..9d135d4 100644
--- a/version.php
+++ b/version.php
@@ -28,8 +28,13 @@
 defined('MOODLE_INTERNAL') || die();
 
 $plugin->component = 'local_twittercard';
-$plugin->version = 2017121000;
-$plugin->release = '1.0.4 (Build: 2017121000)';
+// HACK - Do not install this plugin version on Moodle 3.4+.
+global $CFG, $branch;
+$currentbranch = isset($CFG->branch) ? $CFG->branch : $branch;
+if ($currentbranch === '33') {
+    $plugin->version = 2018040900;
+    $plugin->release = '1.3.0.0 (Build: 2018040900)';
+}
 $plugin->requires = 2017051500;
 $plugin->maturity = MATURITY_STABLE;
 $plugin->cron = 0;