diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..2b967da
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,8 @@
+FROM php:7.0-cli
+RUN apt-get update -yqq
+RUN apt-get install -yqq git libmcrypt-dev libpq-dev libcurl4-gnutls-dev libicu-dev libvpx-dev libjpeg-dev libpng-dev libxpm-dev zlib1g-dev libfreetype6-dev libxml2-dev libexpat1-dev libbz2-dev libgmp3-dev libldap2-dev unixodbc-dev libsqlite3-dev libaspell-dev libsnmp-dev libpcre3-dev libtidy-dev
+# Install PHP extensions
+RUN docker-php-ext-install curl json opcache
+COPY ./ /var/www/html/
+WORKDIR /var/www/html/
+
diff --git a/README.md b/README.md
index 0fc6c34..e578bd9 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # php-dreamkas
-Фискализация чека для Дримкас-Ф для PHP 7.2
+Фискализация чека для Дримкас-Ф для PHP 7.0
 
 Для более старых версий PHP придётся править код на предмет типов у функций.
 
diff --git a/composer.json b/composer.json
index c45eeca..acfcedb 100644
--- a/composer.json
+++ b/composer.json
@@ -3,7 +3,7 @@
     "description": "Фискализация чека для Дримкас-Ф на php",
     "type": "library",
     "require": {
-        "php": "~7.2.0",
+        "php": "~7.0",
         "guzzlehttp/guzzle": "~6.3.0"
     },
     "require-dev": {
diff --git a/composer.lock b/composer.lock
index c8100c6..ac6a3d2 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "0990319a17c4027dba33325c569d9220",
+    "content-hash": "6b56596df8522a59b7ad8cc5365cb7b5",
     "packages": [
         {
             "name": "guzzlehttp/guzzle",
@@ -1570,6 +1570,8 @@
     "stability-flags": [],
     "prefer-stable": false,
     "prefer-lowest": false,
-    "platform": [],
+    "platform": {
+        "php": "~7.0"
+    },
     "platform-dev": []
 }
diff --git a/src/Api.php b/src/Api.php
index 0e6fb78..2d9d6b3 100644
--- a/src/Api.php
+++ b/src/Api.php
@@ -9,9 +9,9 @@
  */
 class Api
 {
-    public const MODE_PRODUCTION = 0;
-    public const MODE_MOCK = 1;
-    public const MODE_DEBUG = 2;
+    const MODE_PRODUCTION = 0;
+    const MODE_MOCK = 1;
+    const MODE_DEBUG = 2;
 
     public $accessToken = '';
     public $deviceId = 0;
@@ -40,7 +40,7 @@ public function __construct(string $accessToken, int $deviceId, int $mode = self
         $this->createClient();
     }
 
-    protected function createClient(): void
+    protected function createClient()
     {
         $baseUri = static::$baseUri[$this->mode] ?? null;
         if ($baseUri === null) {
diff --git a/src/PaymentType.php b/src/PaymentType.php
index 7ed3c44..fd213ad 100644
--- a/src/PaymentType.php
+++ b/src/PaymentType.php
@@ -9,7 +9,7 @@
 class PaymentType
 {
     // нал
-    public const TYPE_CASH = 'CASH';
+    const TYPE_CASH = 'CASH';
     // безнал
-    public const TYPE_CASHLESS = 'CASHLESS';
+    const TYPE_CASHLESS = 'CASHLESS';
 }
\ No newline at end of file
diff --git a/src/Position.php b/src/Position.php
index 4dda713..e3db4b1 100644
--- a/src/Position.php
+++ b/src/Position.php
@@ -9,8 +9,8 @@
  */
 class Position extends Configurable
 {
-    public const TYPE_COUNTABLE = 'COUNTABLE';
-    public const TYPE_SCALABLE = 'SCALABLE';
+    const TYPE_COUNTABLE = 'COUNTABLE';
+    const TYPE_SCALABLE = 'SCALABLE';
 
     public $name = '';
 
diff --git a/src/Receipt.php b/src/Receipt.php
index 80fa2d4..9f6ffb0 100644
--- a/src/Receipt.php
+++ b/src/Receipt.php
@@ -9,10 +9,10 @@
  */
 class Receipt extends Configurable
 {
-    public const TYPE_SALE = 'SALE';
-    public const TYPE_REFUND = 'REFUND';
-    public const TYPE_OUTFLOW = 'OUTFLOW';
-    public const TYPE_OUTFLOW_REFUND = 'OUTFLOW_REFUND';
+    const TYPE_SALE = 'SALE';
+    const TYPE_REFUND = 'REFUND';
+    const TYPE_OUTFLOW = 'OUTFLOW';
+    const TYPE_OUTFLOW_REFUND = 'OUTFLOW_REFUND';
 
     // Тип чека
     public $type = self::TYPE_SALE;
diff --git a/src/TaxMode.php b/src/TaxMode.php
index 4fe7a75..3c1635a 100644
--- a/src/TaxMode.php
+++ b/src/TaxMode.php
@@ -9,15 +9,15 @@
 class TaxMode
 {
     // ОСНО
-    public const MODE_DEFAULT = 'DEFAULT';
+    const MODE_DEFAULT = 'DEFAULT';
     // УСН доход
-    public const MODE_SIMPLE = 'SIMPLE';
+    const MODE_SIMPLE = 'SIMPLE';
     // УСН Доход-расход
-    public const MODE_SIMPLE_WO = 'SIMPLE_WO';
+    const MODE_SIMPLE_WO = 'SIMPLE_WO';
     // ЕНВД
-    public const MODE_ENVD = 'ENVD';
+    const MODE_ENVD = 'ENVD';
     // ЕСХН
-    public const MODE_AGRICULT = 'AGRICULT';
+    const MODE_AGRICULT = 'AGRICULT';
     // Патент
-    public const MODE_PATENT = 'PATENT';
+    const MODE_PATENT = 'PATENT';
 }
diff --git a/src/TaxType.php b/src/TaxType.php
index ccfc2de..d6c1d43 100644
--- a/src/TaxType.php
+++ b/src/TaxType.php
@@ -9,22 +9,22 @@
 class TaxType
 {
     // Без НДС
-    public const TYPE_NDS_NO_TAX = 'NDS_NO_TAX';
+    const TYPE_NDS_NO_TAX = 'NDS_NO_TAX';
 
     // НДС 0
-    public const TYPE_NDS_0 = 'NDS_0';
+    const TYPE_NDS_0 = 'NDS_0';
 
     // НДС 10
-    public const TYPE_NDS_10 = 'NDS_10';
+    const TYPE_NDS_10 = 'NDS_10';
 
     // НДС 18
-    public const TYPE_NDS_18 = 'NDS_18';
+    const TYPE_NDS_18 = 'NDS_18';
 
     // НДС 10/110
-    public const TYPE_NDS_10_CALCULATED = 'NDS_10_CALCULATED';
+    const TYPE_NDS_10_CALCULATED = 'NDS_10_CALCULATED';
 
     // НДС 18/118
-    public const TYPE_NDS_18_CALCULATED = 'NDS_18_CALCULATED';
+    const TYPE_NDS_18_CALCULATED = 'NDS_18_CALCULATED';
 
 
 }
\ No newline at end of file
diff --git a/test.sh b/test.sh
new file mode 100755
index 0000000..52364bb
--- /dev/null
+++ b/test.sh
@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+docker build -t php-dreamkas .
+docker run -it php-dreamkas vendor/bin/phpunit
\ No newline at end of file