diff --git a/apiki-plugin.php b/apiki-plugin.php
new file mode 100644
index 00000000..802f790a
--- /dev/null
+++ b/apiki-plugin.php
@@ -0,0 +1,132 @@
+<?php
+/**
+ * Plugin Name
+ *
+ * @package           WP Plugin Back End Apiki
+ * @author            Francisco Matelli Matulovic
+ * @license           GPL-2.0-or-later
+ *
+ * @wordpress-plugin
+ * Plugin Name:       WP Plugin Back End Apiki
+ * Plugin URI:        https://www.franciscomatelli.com.br
+ * Description:       Code challenge, wp rest favorite post.
+ * Version:           1.0.0
+ * Requires at least: 5.2
+ * Requires PHP:      7.2
+ * Author:            Francisco Matelli Matulovic
+ * Author URI:        https://www.franciscomatelli.com.br
+ * Text Domain:       apiki-chalenge
+ * License:           GPL v2 or later
+ * License URI:       http://www.gnu.org/licenses/gpl-2.0.txt
+ */
+
+add_action('init', 'my_init');
+
+function my_init() {
+    add_action( 'rest_api_init', 'register_posts_meta_field' ); 
+    add_action( 'wp_enqueue_scripts', 'api_test' );
+    add_filter( 'the_content', 'add_content_after');
+}
+
+function register_posts_meta_field() {   
+    $meta_args = array( 
+        'type'         => 'string',
+        'single'       => true,
+        'show_in_rest' => true,
+        'default'      => "padra",
+    );
+    register_meta( 'post', 'favorited_by', $meta_args );
+}
+
+function add_content_after($content) {
+
+    $user_id = get_current_user_id();
+    if($user_id and !is_admin() and is_single()) {
+        
+        $post_id = get_the_ID();
+        $meta = get_post_meta($post_id);
+        $favorited_by_st = $meta["favorited_by"][0];
+        $favorited_by_ar = explode(",", $favorited_by_st);
+        
+        //checa se usuário logado favoritou o post, se está na lista
+        $favoritado = in_array($user_id, $favorited_by_ar);
+        
+        //se não estiver, adiciona pois essa lista é usada para salvar com ele
+        if(!$favoritado) {
+            $favorited_by_ar[] = $user_id;
+        }
+        $arr2 = $favorited_by_ar;
+        foreach($arr2 as $k => $v) {
+            if ($v == $user_id) {
+                unset($arr2[$k]);
+            }
+        }
+        
+        //lista de ids que favoritaram, com o usuário
+        $favcom = implode(",", $favorited_by_ar);
+        //lista de ids que favoritaram, sem o usuário
+        $favsem = implode(",", $arr2);
+        
+        //pode ser melhorado com ícones
+        $txt_btn = $favoritado ?  "FAVORITADO" : "ADICIONAR AOS FAVORITOS";
+        $after_content = '<p><button id="botao-favorito" onclick="fav()">'.$txt_btn.'</button>';
+        ?>
+        
+        <script src="https://cdnjs.cloudflare.com/ajax/libs/axios/0.18.0/axios.js"></script>
+
+        <script>
+        //pega a variável do PHP e joga no JS
+        favoritado = "<?php echo $favoritado; ?>";
+        //
+        async function fav() {
+            if(!favoritado) {
+                favoritado = true;
+                jQuery("#botao-favorito").text("FAVORITADO"); 
+                data = {
+                    "meta": {
+                        "favorited_by": "<?php echo $favcom; ?>",
+                    }
+                }
+            } else {
+                favoritado = false;
+                jQuery("#botao-favorito").text("ADICIONAR AOS FAVORITOS"); 
+                data = {
+                    "meta": {
+                        "favorited_by": "<?php echo $favsem; ?>",
+                    }
+                }
+            }
+            
+            config = {
+                headers:{
+                    'X-WP-Nonce': wpApiSettings.nonce
+                }
+                
+            }
+            
+            await axios.post("/wp-json/wp/v2/posts/<?php echo $post_id; ?>", data, config )
+            .then( function ( response ) {
+                console.log( response );
+            } )
+            .catch( error => console.log( error ) );
+        }
+
+        </script>
+
+        <?php
+        $fullcontent =  $content . $after_content;
+
+        return $fullcontent;
+    }
+
+}
+function api_test() {
+    //wp_enqueue_script( 'axios', 'https://unpkg.com/axios/dist/axios.min.js' );
+
+    wp_localize_script( 'wp-api', 'wpApiSettings', array(
+        'root' => esc_url_raw( rest_url() ),
+        'nonce' => wp_create_nonce( 'wp_rest' ),
+    ) );
+    wp_enqueue_script('wp-api');
+}
+