Add new fields to the Sticker object, plus two new objects, StickerSet, and MaskPosition.

src/Entities/MaskPosition.php

+<?php
+/**
+ * This file is part of the TelegramBot package.
+ *
+ * (c) Avtandil Kikabidze aka LONGMAN <akalongman@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Longman\TelegramBot\Entities;
+
+/**
+ * Class MaskPosition
+ *
+ * @link https://core.telegram.org/bots/api#maskposition
+ *
+ * @method string getPoint()  The part of the face relative to which the mask should be placed. One of “forehead”, “eyes”, “mouth”, or “chin”.
+ * @method float  getXShift() Shift by X-axis measured in widths of the mask scaled to the face size, from left to right. For example, choosing -1.0 will place mask just to the left of the default mask position.
+ * @method float  getYShift() Shift by Y-axis measured in heights of the mask scaled to the face size, from top to bottom. For example, 1.0 will place the mask just below the default mask position.
+ * @method float  getScale()  Mask scaling coefficient. For example, 2.0 means double size.
+ */
+class MaskPosition extends Entity
+{
+
+}

src/Entities/Sticker.php

@@ -20,6 +20,8 @@ namespace Longman\TelegramBot\Entities;
  * @method int          getHeight()       Sticker height
  * @method PhotoSize    getThumb()        Optional. Sticker thumbnail in .webp or .jpg format
  * @method string       getEmoji()        Optional. Emoji associated with the sticker
+ * @method string       getSetName()      Optional. Name of the sticker set to which the sticker belongs
+ * @method MaskPosition getMaskPosition() Optional. For mask stickers, the position where the mask should be placed
  * @method int          getFileSize()     Optional. File size
  */
 class Sticker extends Entity
@@ -31,6 +33,7 @@ class Sticker extends Entity
     {
         return [
             'thumb'         => PhotoSize::class,
+            'mask_position' => MaskPosition::class,
         ];
     }
 }

src/Entities/StickerSet.php

+<?php
+/**
+ * This file is part of the TelegramBot package.
+ *
+ * (c) Avtandil Kikabidze aka LONGMAN <akalongman@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Longman\TelegramBot\Entities;
+
+/**
+ * Class StickerSet
+ *
+ * @link https://core.telegram.org/bots/api#stickerset
+ *
+ * @method string getName()          Sticker set name
+ * @method string getTitle()         Sticker set title
+ * @method bool   getContainsMasks() True, if the sticker set contains masks
+ */
+class StickerSet extends Entity
+{
+    /**
+     * List of all set stickers
+     *
+     * This method overrides the default getStickers method and returns a nice array
+     *
+     * @return Sticker[]
+     */
+    public function getStickers()
+    {
+        $all_stickers = [];
+
+        if ($these_stickers = $this->getProperty('stickers')) {
+            foreach ($these_stickers as $stickers) {
+                $new_stickers = [];
+                foreach ($stickers as $sticker) {
+                    $new_stickers[] = new Sticker($sticker);
+                }
+                $all_stickers[] = $new_stickers;
+            }
+        }
+
+        return $all_stickers;
+    }
+}