diff --git a/plugins/apiki/apiki.php b/plugins/apiki/apiki.php
new file mode 100644
index 00000000..6d22927d
--- /dev/null
+++ b/plugins/apiki/apiki.php
@@ -0,0 +1,108 @@
+<?php
+
+/**
+ * Plugin Name: WordPress Back-end Challenge
+ * Version: 0.0.1
+ * Plugin URI: 
+ * Description: Apiki challenge
+ * Author: Wayne Rocha
+ * Author URI: 
+ *
+ * @package WordPress
+ * @author Wayne Rocha
+ * @since 2.4.0
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+class WP_Apiki_REST {
+    private string $api_route_namespace = 'apiki/v1';
+    private $table_name;
+
+    public function __construct($table_name) {
+        $this->table_name = $table_name;
+    }
+
+    public function register_routes(){
+
+        register_rest_route($this->api_route_namespace, '/favorite_posts',
+            [
+                'methods' => "POST",
+                'callback' => [$this, 'toggle_favorite'],
+                'permission_callback' => function () {
+                    return is_user_logged_in();
+                },
+            ],
+            true
+        );
+    }
+
+    public function toggle_favorite($request) {
+        $user_id = get_current_user_id();
+        $post_id = intval($request->get_param('post_id'));
+
+        if (!get_post($post_id)) {
+            return new WP_Error('invalid_post', 'O post não existe.', ['status' => 404]);
+        }
+
+        global $wpdb;
+
+        $exists = $wpdb->get_var($wpdb->prepare(
+            "SELECT COUNT(*) FROM {$this->table_name} WHERE user_id = %d AND post_id = %d",
+            $user_id,
+            $post_id
+        ));
+
+        if ($exists) {
+            $wpdb->delete($this->table_name, ['user_id' => $user_id, 'post_id' => $post_id]);
+            return rest_ensure_response(['status' => 'removed']);
+        }
+
+        $result = $wpdb->insert($this->table_name, ['user_id' => $user_id, 'post_id' => $post_id]);
+
+        if ($result === false) {
+            return new WP_Error('db_error', __('Erro ao favoritar o post.', 'wp-apiki'), ['status' => 500]);
+        }
+        return rest_ensure_response(['status' => 'added']);
+    }
+}
+
+class WP_Apiki_Plugin {
+    public string $table_name;
+
+    public function __construct() {
+        global $wpdb;
+        $this->table_name = $wpdb->prefix . 'apiki_favorites';
+    }
+
+    public function create_table() {
+        global $wpdb;
+
+	    if ($wpdb->get_var("SHOW TABLES LIKE '{$this->table_name}'") != $this->table_name) {
+            $charset_collate = $wpdb->get_charset_collate();
+            $sql = "CREATE TABLE {$this->table_name} (
+                id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
+                user_id BIGINT(20) UNSIGNED NOT NULL,
+                post_id BIGINT(20) UNSIGNED NOT NULL,
+                PRIMARY KEY (id),
+                UNIQUE KEY user_post (user_id, post_id)
+            ) $charset_collate;";
+    
+            require_once ABSPATH . 'wp-admin/includes/upgrade.php';
+            dbDelta($sql);
+        }
+
+    }
+}
+
+function wp_plugin_init() {
+    $apiki_plugin = new WP_Apiki_Plugin();
+    $apiki_rest = new WP_Apiki_REST($apiki_plugin->table_name);
+
+    register_activation_hook(__FILE__, [$apiki_plugin, 'create_table']);
+    add_action("rest_api_init", [$apiki_rest, "register_routes"]);
+}
+
+add_action('plugins_loaded', 'wp_plugin_init');