diff --git a/src/Autoload/Loader.php b/src/Autoload/Loader.php
index 40367b7..b11e3f0 100644
--- a/src/Autoload/Loader.php
+++ b/src/Autoload/Loader.php
@@ -336,6 +336,15 @@ public function unregister(): Loader
     {
     }
 
+    /**
+     * returns isRegister
+     *
+     * @return bool
+     */
+    public function isRegistered(): bool
+    {
+    }
+
     /**
      * If the file exists, require it and return true; false otherwise
      *
diff --git a/src/Encryption/Security/JWT/Builder.php b/src/Encryption/Security/JWT/Builder.php
index 1242377..cbda119 100644
--- a/src/Encryption/Security/JWT/Builder.php
+++ b/src/Encryption/Security/JWT/Builder.php
@@ -20,7 +20,14 @@
 use Phalcon\Support\Helper\Json\Encode;
 
 /**
- * JWT Builder
+ * Builder
+ *
+ * The builder offers
+ *
+ * @property CollectionInterface $claims
+ * @property CollectionInterface $jose
+ * @property string              $passphrase
+ * @property SignerInterface     $signer
  *
  * @link https://tools.ietf.org/html/rfc7519
  */
@@ -79,6 +86,18 @@ public function addClaim(string $name, $value): Builder
     {
     }
 
+    /**
+     * Adds a custom header
+     *
+     * @param string $name
+     * @param mixed  $value
+     *
+     * @return Builder
+     */
+    public function addHeader(string $name, $value): Builder
+    {
+    }
+
     /**
      * @return array|string
      */
diff --git a/src/Encryption/Security/JWT/Token/Token.php b/src/Encryption/Security/JWT/Token/Token.php
index 023b04a..931a292 100644
--- a/src/Encryption/Security/JWT/Token/Token.php
+++ b/src/Encryption/Security/JWT/Token/Token.php
@@ -49,6 +49,8 @@ public function __construct(Item $headers, Item $claims, Signature $signature)
     }
 
     /**
+     * Return the registered claims
+     *
      * @return Item
      */
     public function getClaims(): Item
@@ -56,6 +58,8 @@ public function getClaims(): Item
     }
 
     /**
+     * Return the registered headers
+     *
      * @return Item
      */
     public function getHeaders(): Item
@@ -63,6 +67,8 @@ public function getHeaders(): Item
     }
 
     /**
+     * Return the payload
+     *
      * @return string
      */
     public function getPayload(): string
@@ -70,6 +76,8 @@ public function getPayload(): string
     }
 
     /**
+     * Return the signature
+     *
      * @return Signature
      */
     public function getSignature(): Signature
@@ -77,6 +85,8 @@ public function getSignature(): Signature
     }
 
     /**
+     * Return the token
+     *
      * @return string
      */
     public function getToken(): string
diff --git a/src/Encryption/Security/JWT/Validator.php b/src/Encryption/Security/JWT/Validator.php
index 665cb79..f6e7423 100644
--- a/src/Encryption/Security/JWT/Validator.php
+++ b/src/Encryption/Security/JWT/Validator.php
@@ -50,6 +50,8 @@ public function __construct(\Phalcon\Encryption\Security\JWT\Token\Token $token,
     }
 
     /**
+     * Return an array with validation errors (if any)
+     *
      * @return array
      */
     public function getErrors(): array
@@ -57,16 +59,22 @@ public function getErrors(): array
     }
 
     /**
+     * Return the value of a claim
+     *
      * @param string $claim
-     * @return mixed|null
+     *
+     * @return mixed
      */
     public function get(string $claim)
     {
     }
 
     /**
+     * Set the value of a claim, for comparison with the token values
+     *
      * @param string $claim
-     * @param mixed $value
+     * @param mixed  $value
+     *
      * @return Validator
      */
     public function set(string $claim, $value): Validator
@@ -74,6 +82,8 @@ public function set(string $claim, $value): Validator
     }
 
     /**
+     * Set the token to be validated
+     *
      * @param Token $token
      *
      * @return Validator
@@ -83,6 +93,8 @@ public function setToken(\Phalcon\Encryption\Security\JWT\Token\Token $token): V
     }
 
     /**
+     * Validate the audience
+     *
      * @param string|array $audience
      *
      * @return Validator
@@ -93,6 +105,8 @@ public function validateAudience($audience): Validator
     }
 
     /**
+     * Validate the expiration time of the token
+     *
      * @param int $timestamp
      *
      * @return Validator
@@ -103,6 +117,8 @@ public function validateExpiration(int $timestamp): Validator
     }
 
     /**
+     * Validate the id of the token
+     *
      * @param string $id
      *
      * @return Validator
@@ -113,6 +129,8 @@ public function validateId(string $id): Validator
     }
 
     /**
+     * Validate the issued at (iat) of the token
+     *
      * @param int $timestamp
      *
      * @return Validator
@@ -123,6 +141,8 @@ public function validateIssuedAt(int $timestamp): Validator
     }
 
     /**
+     * Validate the issuer of the token
+     *
      * @param string $issuer
      *
      * @return Validator
@@ -133,6 +153,8 @@ public function validateIssuer(string $issuer): Validator
     }
 
     /**
+     * Validate the notbefore (nbf) of the token
+     *
      * @param int $timestamp
      *
      * @return Validator
@@ -143,6 +165,8 @@ public function validateNotBefore(int $timestamp): Validator
     }
 
     /**
+     * Validate the signature of the token
+     *
      * @param SignerInterface $signer
      * @param string          $passphrase
      *
diff --git a/src/Http/Request.php b/src/Http/Request.php
index f9ce709..1b5e754 100644
--- a/src/Http/Request.php
+++ b/src/Http/Request.php
@@ -986,4 +986,13 @@ public function getFilteredData(string $methodKey, string $method, string $name
     private function getPatchPut(string $collection, string $name = null, $filters = null, $defaultValue = null, bool $notAllowEmpty = false, bool $noRecursive = false)
     {
     }
+
+    /**
+     * parse multipart/form-data from raw data
+     *
+     * @return array
+     */
+    private function getFormData(): array
+    {
+    }
 }
diff --git a/src/Mvc/Model.php b/src/Mvc/Model.php
index 6efdc14..ebcebc2 100644
--- a/src/Mvc/Model.php
+++ b/src/Mvc/Model.php
@@ -2220,4 +2220,14 @@ public function validationHasFailed(): bool
     private static function caseInsensitiveColumnMap($columnMap, $key): string
     {
     }
+
+    /**
+     * Append messages to this model from another Model.
+     *
+     * @param mixed $model
+     * @return void
+     */
+    public function appendMessagesFrom($model): void
+    {
+    }
 }
diff --git a/src/Mvc/Model/MetaData.php b/src/Mvc/Model/MetaData.php
index a69b669..1504dc3 100644
--- a/src/Mvc/Model/MetaData.php
+++ b/src/Mvc/Model/MetaData.php
@@ -451,8 +451,9 @@ final public function readColumnMap(\Phalcon\Mvc\ModelInterface $model): ?array
      *
      * @param \Phalcon\Mvc\ModelInterface $model
      * @param int $index
+     * @return array|null
      */
-    final public function readColumnMapIndex(\Phalcon\Mvc\ModelInterface $model, int $index)
+    final public function readColumnMapIndex(\Phalcon\Mvc\ModelInterface $model, int $index): ?array
     {
     }
 
@@ -468,9 +469,9 @@ final public function readColumnMapIndex(\Phalcon\Mvc\ModelInterface $model, int
      * ```
      *
      * @param \Phalcon\Mvc\ModelInterface $model
-     * @return array
+     * @return array|null
      */
-    final public function readMetaData(\Phalcon\Mvc\ModelInterface $model): array
+    final public function readMetaData(\Phalcon\Mvc\ModelInterface $model): ?array
     {
     }
 
@@ -488,8 +489,9 @@ final public function readMetaData(\Phalcon\Mvc\ModelInterface $model): array
      *
      * @param \Phalcon\Mvc\ModelInterface $model
      * @param int $index
+     * @return array|null
      */
-    final public function readMetaDataIndex(\Phalcon\Mvc\ModelInterface $model, int $index)
+    final public function readMetaDataIndex(\Phalcon\Mvc\ModelInterface $model, int $index): ?array
     {
     }
 
@@ -622,7 +624,7 @@ final public function writeMetaDataIndex(\Phalcon\Mvc\ModelInterface $model, int
     }
 
     /**
-     * Initialize the metadata for certain table
+     * Initialize old behavior for compatability
      *
      * @param \Phalcon\Mvc\ModelInterface $model
      * @param mixed $key
@@ -633,6 +635,28 @@ final protected function initialize(\Phalcon\Mvc\ModelInterface $model, $key, $t
     {
     }
 
+    /**
+     * Initialize the metadata for certain table
+     *
+     * @param \Phalcon\Mvc\ModelInterface $model
+     * @param mixed $key
+     * @return bool
+     */
+    final protected function initializeMetaData(\Phalcon\Mvc\ModelInterface $model, $key): bool
+    {
+    }
+
+    /**
+     * Initialize ColumnMap for a certain table
+     *
+     * @param \Phalcon\Mvc\ModelInterface $model
+     * @param mixed $key
+     * @return bool
+     */
+    final protected function initializeColumnMap(\Phalcon\Mvc\ModelInterface $model, $key): bool
+    {
+    }
+
     /**
      * Throws an exception when the metadata cannot be written
      *
@@ -653,4 +677,24 @@ private function throwWriteException($option): void
     protected function getArrVal(array $collection, $index, $defaultValue = null)
     {
     }
+
+    /**
+     * Returns a MetaData Unique key for meta-data is created using className
+     *
+     * @return string
+     * @param \Phalcon\Mvc\ModelInterface $model
+     */
+    final public function getMetaDataUniqueKey(\Phalcon\Mvc\ModelInterface $model): ?string
+    {
+    }
+
+    /**
+     * Returns a ColumnMap Unique key for meta-data is created using className
+     *
+     * @return string
+     * @param \Phalcon\Mvc\ModelInterface $model
+     */
+    final public function getColumnMapUniqueKey(\Phalcon\Mvc\ModelInterface $model): ?string
+    {
+    }
 }
diff --git a/src/Mvc/Model/MetaDataInterface.php b/src/Mvc/Model/MetaDataInterface.php
index 41db4a7..6fed124 100644
--- a/src/Mvc/Model/MetaDataInterface.php
+++ b/src/Mvc/Model/MetaDataInterface.php
@@ -175,25 +175,26 @@ public function readColumnMap(\Phalcon\Mvc\ModelInterface $model): ?array;
      *
      * @param \Phalcon\Mvc\ModelInterface $model
      * @param int $index
+     * @return array|null
      */
-    public function readColumnMapIndex(\Phalcon\Mvc\ModelInterface $model, int $index);
+    public function readColumnMapIndex(\Phalcon\Mvc\ModelInterface $model, int $index): ?array;
 
     /**
      * Reads meta-data for certain model
      *
      * @param \Phalcon\Mvc\ModelInterface $model
-     * @return array
+     * @return array|null
      */
-    public function readMetaData(\Phalcon\Mvc\ModelInterface $model): array;
+    public function readMetaData(\Phalcon\Mvc\ModelInterface $model): ?array;
 
     /**
      * Reads meta-data for certain model using a MODEL_ constant
      *
      * @param \Phalcon\Mvc\ModelInterface $model
      * @param int $index
-     * @return mixed
+     * @return array|null
      */
-    public function readMetaDataIndex(\Phalcon\Mvc\ModelInterface $model, int $index);
+    public function readMetaDataIndex(\Phalcon\Mvc\ModelInterface $model, int $index): ?array;
 
     /**
      * Resets internal meta-data in order to regenerate it