diff --git a/src/Bot/Model/Entity/Channel/ChannelSettings.php b/src/Bot/Model/Entity/Channel/ChannelSettings.php
index 57bd31c..d8a8310 100644
--- a/src/Bot/Model/Entity/Channel/ChannelSettings.php
+++ b/src/Bot/Model/Entity/Channel/ChannelSettings.php
@@ -38,9 +38,9 @@ class ChannelSettings
     private $status;
 
     /**
-     * @var int $spamAllowed
+     * @var bool $spamAllowed
      *
-     * @Type("int")
+     * @Type("bool")
      * @Accessor(getter="getStatus",setter="setStatus")
      */
     private $spamAllowed;
@@ -107,17 +107,17 @@ class ChannelSettings
     }
 
     /**
-     * @return int
+     * @return bool
      */
-    public function getSpamAllowed(): int
+    public function isSpamAllowed(): bool
     {
         return $this->spamAllowed;
     }
 
     /**
-     * @param int $spamAllowed
+     * @param bool $spamAllowed
      */
-    public function setSpamAllowed(int $spamAllowed)
+    public function setSpamAllowed(bool $spamAllowed): void
     {
         $this->spamAllowed = $spamAllowed;
     }
diff --git a/src/Bot/Model/Entity/Channel/ChannelSettingsItem.php b/src/Bot/Model/Entity/Channel/ChannelSettingsItem.php
index f9f24b9..608b466 100644
--- a/src/Bot/Model/Entity/Channel/ChannelSettingsItem.php
+++ b/src/Bot/Model/Entity/Channel/ChannelSettingsItem.php
@@ -74,6 +74,15 @@ class ChannelSettingsItem
      */
     private $delivered;
 
+    /**
+     * @var int $maxCharsCount
+     *
+     * @Type("int")
+     * @Accessor(getter="getMaxCharsCount",setter="setMaxCharsCount")
+     * @SkipWhenEmpty()
+     */
+    private $maxCharsCount;
+
     /**
      * @var int $maxItemsCount
      *
@@ -83,6 +92,15 @@ class ChannelSettingsItem
      */
     private $maxItemsCount;
 
+    /**
+     * @var int $noteMaxCharsCount
+     *
+     * @Type("int")
+     * @Accessor(getter="getNoteMaxCharsCount", setter="setNoteMaxCharsCount")
+     * @SkipWhenEmpty()
+     */
+    private $noteMaxCharsCount;
+
     /**
      * @return string
      */
@@ -163,6 +181,22 @@ class ChannelSettingsItem
         $this->delivered = $delivered;
     }
 
+    /**
+     * @return int
+     */
+    public function getMaxCharsCount(): int
+    {
+        return $this->maxCharsCount;
+    }
+
+    /**
+     * @param int $maxCharsCount
+     */
+    public function setMaxCharsCount(int $maxCharsCount): void
+    {
+        $this->maxCharsCount = $maxCharsCount;
+    }
+
     /**
      * @return int
      */
@@ -178,4 +212,20 @@ class ChannelSettingsItem
     {
         $this->maxItemsCount = $maxItemsCount;
     }
+
+    /**
+     * @return int
+     */
+    public function getNoteMaxCharsCount(): int
+    {
+        return $this->noteMaxCharsCount;
+    }
+
+    /**
+     * @param int $noteMaxCharsCount
+     */
+    public function setNoteMaxCharsCount(int $noteMaxCharsCount): void
+    {
+        $this->noteMaxCharsCount = $noteMaxCharsCount;
+    }
 }
diff --git a/src/Bot/Model/Entity/Customer.php b/src/Bot/Model/Entity/Customer.php
index 049b4f3..279300f 100644
--- a/src/Bot/Model/Entity/Customer.php
+++ b/src/Bot/Model/Entity/Customer.php
@@ -13,7 +13,7 @@
 
 namespace RetailCrm\Mg\Bot\Model\Entity;
 
-use RetailCrm\Mg\Bot\Model\Entity\CommonFields;
+use Symfony\Component\Validator\Constraints as Assert;
 use JMS\Serializer\Annotation\Accessor;
 use JMS\Serializer\Annotation\SkipWhenEmpty;
 use JMS\Serializer\Annotation\Type;
@@ -39,6 +39,8 @@ class Customer
      * @Type("string")
      * @Accessor(getter="getExternalId",setter="setExternalId")
      * @SkipWhenEmpty()
+     * @Assert\Length(max="64")
+     * @Assert\NotNull()
      */
     private $externalId;
 
@@ -57,6 +59,7 @@ class Customer
      * @Type("string")
      * @Accessor(getter="getUsername",setter="setUsername")
      * @SkipWhenEmpty()
+     * @Assert\Length(max="255")
      */
     private $username;
 
@@ -66,6 +69,7 @@ class Customer
      * @Type("string")
      * @Accessor(getter="getFirstName",setter="setFirstName")
      * @SkipWhenEmpty()
+     * @Assert\Length(max="255")
      */
     private $firstName;
 
@@ -75,6 +79,7 @@ class Customer
      * @Type("string")
      * @Accessor(getter="getLastName",setter="setLastName")
      * @SkipWhenEmpty()
+     * @Assert\Length(max="255")
      */
     private $lastName;
 
@@ -84,6 +89,7 @@ class Customer
      * @Type("string")
      * @Accessor(getter="getAvatarUrl",setter="setAvatarUrl")
      * @SkipWhenEmpty()
+     * @Assert\Length(max="255")
      */
     private $avatarUrl;
 
@@ -93,6 +99,7 @@ class Customer
      * @Type("string")
      * @Accessor(getter="getProfileUrl",setter="setProfileUrl")
      * @SkipWhenEmpty()
+     * @Assert\Length(max="255")
      */
     private $profileUrl;
 
@@ -111,6 +118,7 @@ class Customer
      * @Type("string")
      * @Accessor(getter="getCountry",setter="setCountry")
      * @SkipWhenEmpty()
+     * @Assert\Length(max="2")
      */
     private $country;
 
@@ -120,6 +128,7 @@ class Customer
      * @Type("string")
      * @Accessor(getter="getLanguage",setter="setLanguage")
      * @SkipWhenEmpty()
+     * @Assert\Length(max="20")
      */
     private $language;
 
@@ -129,6 +138,7 @@ class Customer
      * @Type("string")
      * @Accessor(getter="getPhone",setter="setPhone")
      * @SkipWhenEmpty()
+     * @Assert\Length(max="16")
      */
     private $phone;
 
@@ -138,6 +148,7 @@ class Customer
      * @Type("string")
      * @Accessor(getter="getEmail",setter="setEmail")
      * @SkipWhenEmpty()
+     * @Assert\Length(max="16")
      */
     private $email;
 
diff --git a/src/Bot/Model/Entity/User.php b/src/Bot/Model/Entity/User.php
index 438483e..b3b3540 100644
--- a/src/Bot/Model/Entity/User.php
+++ b/src/Bot/Model/Entity/User.php
@@ -37,6 +37,7 @@ class User
      * @Type("string")
      * @Accessor(getter="getExternalId",setter="setExternalId")
      * @SkipWhenEmpty()
+     * @Assert\Length(max="64")
      */
     private $externalId;
 
@@ -73,6 +74,7 @@ class User
      * @Type("string")
      * @Accessor(getter="getUsername",setter="setUsername")
      * @SkipWhenEmpty()
+     * @Assert\Length(max="255")
      */
     private $username;
 
@@ -82,6 +84,7 @@ class User
      * @Type("string")
      * @Accessor(getter="getFirstName",setter="setFirstName")
      * @SkipWhenEmpty()
+     * @Assert\Length(max="255")
      */
     private $firstName;
 
@@ -91,6 +94,7 @@ class User
      * @Type("string")
      * @Accessor(getter="getLastName",setter="setLastName")
      * @SkipWhenEmpty()
+     * @Assert\Length(max="255")
      */
     private $lastName;
 
diff --git a/tests/Bot/Test/TestCase.php b/tests/Bot/Test/TestCase.php
index c05f10e..6722555 100644
--- a/tests/Bot/Test/TestCase.php
+++ b/tests/Bot/Test/TestCase.php
@@ -100,7 +100,12 @@ class TestCase extends BaseCase
      */
     public function getJsonResponse(string $jsonFile, int $statusCode = 200)
     {
-        $fileName = realpath(join(DIRECTORY_SEPARATOR, [__DIR__, '..', '..', 'Resources', "${jsonFile}.json"]));
+        $fileName = realpath(
+            join(
+                DIRECTORY_SEPARATOR,
+                [__DIR__, '..', '..', 'Resources', \sprintf('%s.json', $jsonFile)]
+            )
+        );
 
         if (file_exists($fileName)) {
             $json = file_get_contents($fileName);