diff --git a/code_samples/php/v2.0.0/create_payment.php b/code_samples/php/v2.0.0/create_payment.php
index 0b1c994..8bd5a9f 100644
--- a/code_samples/php/v2.0.0/create_payment.php
+++ b/code_samples/php/v2.0.0/create_payment.php
@@ -20,7 +20,9 @@
             "currency" => "EUR",
         ]),
         "end_to_end" => new Tatrapayplus\TatrapayplusApiClient\Model\E2e([
-            "variable_symbol" => "ORDER123456",
+            "variable_symbol" => "1",
+            "specific_symbol" => "2",
+            "constant_symbol" => "3",
         ]),
     ]),
     "bank_transfer" => new Tatrapayplus\TatrapayplusApiClient\Model\BankTransfer(),
diff --git a/code_samples/php/v2.0.0/create_payment_pre_authorization.php b/code_samples/php/v2.0.0/create_payment_pre_authorization.php
index f9a8de5..1d987db 100644
--- a/code_samples/php/v2.0.0/create_payment_pre_authorization.php
+++ b/code_samples/php/v2.0.0/create_payment_pre_authorization.php
@@ -13,7 +13,9 @@
             "currency" => "EUR",
         ]),
         "end_to_end" => new Tatrapayplus\TatrapayplusApiClient\Model\E2e([
-            "variable_symbol" => "ORDER123456",
+            "variable_symbol" => "1",
+            "specific_symbol" => "2",
+            "constant_symbol" => "3",
         ]),
     ]),
     "bank_transfer" => new Tatrapayplus\TatrapayplusApiClient\Model\BankTransfer(),
diff --git a/docs/libraries/php/v2.0.0/index.mdx b/docs/libraries/php/v2.0.0/index.mdx
index fc904e1..f5cbbfa 100644
--- a/docs/libraries/php/v2.0.0/index.mdx
+++ b/docs/libraries/php/v2.0.0/index.mdx
@@ -4,13 +4,31 @@ To be able to use and test payment gateway you need to have **Client ID** and **
 
 # Installation
 
-To install PHP SDK, you need to install `tatrapayplus/tatrapayplus_api_client` library via composer.
+To install PHP SDK, you need to install `tatrapayplus/tatrapayplus_api_client` library via composer.\
+Inside your `composer.json` file for your project, add new requirement:
+
+```json
+{
+    "name": "project name",
+    // ...
+    "require": {
+        // ...
+        "tatrapayplus/tatrapayplus_api_client": "2.0.0"
+    },
+    // ...
+}
+```
+
+Afterwards, run command `composer install` to install new dependency.
 
 # Client initialization
 
 To start working with the API, you need to initialize the TatraPayPlusAPIApi with the following parameters:
 
 ```php
+<?php
+use Tatrapayplus\TatrapayplusApiClient\Api\TatraPayPlusAPIApi;
+
 $tatrapayplus_api = new TatraPayPlusAPIApi(
     "your-client-id",
     "your-client-secret",
diff --git a/docs/libraries/php/v2.0.0/save_card.mdx b/docs/libraries/php/v2.0.0/save_card.mdx
index 1bf3c50..20f5fd7 100644
--- a/docs/libraries/php/v2.0.0/save_card.mdx
+++ b/docs/libraries/php/v2.0.0/save_card.mdx
@@ -20,7 +20,9 @@ $initiate_payment_request = new Tatrapayplus\TatrapayplusApiClient\Model\Initiat
             "currency" => "EUR",
         ]),
         "end_to_end" => new Tatrapayplus\TatrapayplusApiClient\Model\E2e([
-            "variable_symbol" => "ORDER123456",
+            "variable_symbol" => "1",
+            "specific_symbol" => "2",
+            "constant_symbol" => "3",
         ]),
     ]),
     "card_detail" => new Tatrapayplus\TatrapayplusApiClient\Model\CardDetail([
@@ -72,7 +74,9 @@ $initiate_payment_request = new Tatrapayplus\TatrapayplusApiClient\Model\Initiat
             "currency" => "EUR",
         ]),
         "end_to_end" => new Tatrapayplus\TatrapayplusApiClient\Model\E2e([
-            "variable_symbol" => "ORDER123456",
+            "variable_symbol" => "1",
+            "specific_symbol" => "2",
+            "constant_symbol" => "3",
         ]),
     ]),
     "user_data" => new Tatrapayplus\TatrapayplusApiClient\Model\UserData([
diff --git a/i18n/sk/docusaurus-plugin-content-docs/current/libraries/php/v2.0.0/index.mdx b/i18n/sk/docusaurus-plugin-content-docs/current/libraries/php/v2.0.0/index.mdx
index 54edac3..40d9d2d 100644
--- a/i18n/sk/docusaurus-plugin-content-docs/current/libraries/php/v2.0.0/index.mdx
+++ b/i18n/sk/docusaurus-plugin-content-docs/current/libraries/php/v2.0.0/index.mdx
@@ -4,13 +4,31 @@ Aby ste mohli používať a testovať platobnú bránu, potrebujete **Client ID*
 
 # Inštalácia
 
-Na inštaláciu PHP SDK je potrebné nainštalovať knižnicu `tatrapayplus/tatrapayplus_api_client` cez composer.
+Na inštaláciu PHP SDK je potrebné nainštalovať `tatrapayplus/tatrapayplus_api_client` cez composer.\
+Do súboru `composer.json` pre váš projekt pridajte novú požiadavku:
+
+```json
+{
+    "name": "nazov projektu",
+    // ...
+    "require": {
+        // ...
+        "tatrapayplus/tatrapayplus_api_client": "2.0.0"
+    },
+    // ...
+}
+```
+
+Následne spustite príkaz `composer install` pre inštaláciu balíka.
 
 # Vytvorenie API klienta
 
 Pre prácu s API potrebujete inicializovať TatraPayPlusAPIApi s nasledovnými parametrami:
 
 ```php
+<?php
+use Tatrapayplus\TatrapayplusApiClient\Api\TatraPayPlusAPIApi;
+
 $tatrapayplus_api = new TatraPayPlusAPIApi(
     "your-client-id",
     "your-client-secret",
diff --git a/i18n/sk/docusaurus-plugin-content-docs/current/libraries/php/v2.0.0/save_card.mdx b/i18n/sk/docusaurus-plugin-content-docs/current/libraries/php/v2.0.0/save_card.mdx
index 47e379f..b899938 100644
--- a/i18n/sk/docusaurus-plugin-content-docs/current/libraries/php/v2.0.0/save_card.mdx
+++ b/i18n/sk/docusaurus-plugin-content-docs/current/libraries/php/v2.0.0/save_card.mdx
@@ -20,7 +20,9 @@ $initiate_payment_request = new Tatrapayplus\TatrapayplusApiClient\Model\Initiat
             "currency" => "EUR",
         ]),
         "end_to_end" => new Tatrapayplus\TatrapayplusApiClient\Model\E2e([
-            "variable_symbol" => "ORDER123456",
+            "variable_symbol" => "1",
+            "specific_symbol" => "2",
+            "constant_symbol" => "3",
         ]),
     ]),
     "card_detail" => new Tatrapayplus\TatrapayplusApiClient\Model\CardDetail([
@@ -72,7 +74,9 @@ $initiate_payment_request = new Tatrapayplus\TatrapayplusApiClient\Model\Initiat
             "currency" => "EUR",
         ]),
         "end_to_end" => new Tatrapayplus\TatrapayplusApiClient\Model\E2e([
-            "variable_symbol" => "ORDER123456",
+            "variable_symbol" => "1",
+            "specific_symbol" => "2",
+            "constant_symbol" => "3",
         ]),
     ]),
     "user_data" => new Tatrapayplus\TatrapayplusApiClient\Model\UserData([