diff --git a/README.md b/README.md
index b1431e9..567c8b5 100644
--- a/README.md
+++ b/README.md
@@ -8,28 +8,28 @@
 
 ## Requirements
 
-PHP: >= 8.1  
-Extensions: 
+PHP: >= 8.1
+Extensions:
 - [Composer](https://getcomposer.org/)
 - [PHP-JSON](https://www.php.net/manual/en/book.json.php)
 - [PSR-18 HTTP-Client](https://packagist.org/providers/psr/http-client-implementation)
 
 ## Install
 
-composer:  
+composer:
 `composer require sysix/lex-office-api`
 
 ## Usage
 
-Search for the [official API Documentation](https://developers.lexoffice.io/docs/).  
+Search for the [official API Documentation](https://developers.lexoffice.io/docs/).
 You need an [API Key](https://app.lexoffice.de/addons/public-api) for that.
 
 ### Basic
 ```php
 // store keys in .env file
-$apiKey = getenv('LEXOFFICE_API_KEY'); 
+$apiKey = getenv('LEXOFFICE_API_KEY');
 
-// in this example we are using guzzlehttp/guzzle package, it can be any PSR-18 HTTP Client 
+// in this example we are using guzzlehttp/guzzle package, it can be any PSR-18 HTTP Client
 // see: https://packagist.org/providers/psr/http-client-implementation
 $httpClient = \GuzzleHttp\Client();
 $api = new \Sysix\LexOffice\Api($apiKey, $httpClient);
@@ -37,13 +37,13 @@ $api = new \Sysix\LexOffice\Api($apiKey, $httpClient);
 
 ### Optimize your HTTP Client
 
-This library only prepares the `\Psr\Http\Message\RequestInterface` for the HTTP Client and returns its Response.  
-There are almost no error checks, no caching and no rate limiting. Your PSR-18 HTTP Client should come with a way to deal with it.  
+This library only prepares the `\Psr\Http\Message\RequestInterface` for the HTTP Client and returns its Response.
+There are almost no error checks, no caching and no rate limiting. Your PSR-18 HTTP Client should come with a way to deal with it.
 
 Here is a example with `guzzlehttp/guzzle` , `kevinrob/guzzle-cache-middleware` and `spatie/guzzle-rate-limiter-middleware`:
 
 ```php
-$apiKey = getenv('LEXOFFICE_API_KEY'); 
+$apiKey = getenv('LEXOFFICE_API_KEY');
 
 $stack = \GuzzleHttp\HandlerStack::create();
 $stack->push(new \Kevinrob\GuzzleCache\CacheMiddleware(), 'cache');
@@ -72,7 +72,7 @@ $client->type = 'PRODUCT';
 
 
 // get a page
-$response = $client->getPage(0);    
+$response = $client->getPage(0);
 
 // other methods
 $response = $client->get($entityId);
@@ -96,7 +96,7 @@ $client->customer = true;
 $client->vendor = false;
 
 // get a page
-$response = $client->getPage(0);    
+$response = $client->getPage(0);
 
 // other methods
 $response = $client->get($entityId);
@@ -118,9 +118,13 @@ $response = $api->creditNote()->create($data);
 $response = $api->creditNote()->create($data, true); // finalized
 $response = $api->creditNote()->pursue($precedingSalesVoucherId, $data);
 $response = $api->creditNote()->pursue($precedingSalesVoucherId, $data, true); // finalized
+$response = $api->creditNote()->file($entityId); // get file content
+$response = $api->creditNote()->file($entityId, 'application/xml'); // as XRechnung
+
+// deprecated methods:
 $response = $api->creditNote()->document($entityId); // get document ID
 $response = $api->creditNote()->document($entityId, true); // get file content
-$response = $api->creditNote()->document($entityId, true, 'image/*'); // accept only images
+$response = $api->creditNote()->document($entityId, true, 'application/xml'); // as XRechnung
 ```
 
 ### Deliverys Notes Endpoint
@@ -129,9 +133,11 @@ $voucherList = $api->deliveryNote()->getVoucherListClient(); // see VoucherlistC
 $response = $api->deliveryNote()->get($entityId);
 $response = $api->deliveryNote()->create($data);
 $response = $api->deliveryNote()->pursue($precedingSalesVoucherId, $data);
+$response = $api->deliveryNote()->file($entityId); // get file content
+
+// deprecated methods:
 $response = $api->deliveryNote()->document($entityId); // get document ID
 $response = $api->deliveryNote()->document($entityId, true); // get file content
-$response = $api->deliveryNote()->document($entityId, true, 'image/*'); // accept only images
 ```
 
 ### Down Payment Invoices Endpoint
@@ -139,18 +145,24 @@ $response = $api->deliveryNote()->document($entityId, true, 'image/*'); // accep
 $voucherList = $api->downPaymentInvoice()->getVoucherListClient(); // see VoucherlistClient Documentation
 $response = $api->downPaymentInvoice()->get($entityId);
 $response = $api->downPaymentInvoice()->create($data);
+$response = $api->downPaymentInvoice()->file($entityId); // get file content
+$response = $api->downPaymentInvoice()->file($entityId, 'application/xml'); // as XRechnung
+
+// deprecated methods:
 $response = $api->downPaymentInvoice()->document($entityId); // get document ID
 $response = $api->downPaymentInvoice()->document($entityId, true); // get file content
-$response = $api->downPaymentInvoice()->document($entityId, true, 'image/*'); // accept only images
+$response = $api->downPaymentInvoice()->document($entityId, true, 'application/xml'); // as XRechnung
 ```
 
 ### Dunnings Endpoint
 ```php
 $response = $api->dunning()->get($entityId);
 $response = $api->dunning()->pursue($precedingSalesVoucherId, $data);
+$response = $api->dunning()->file($entityId); // get file content
+
+// deprecated methods:
 $response = $api->dunning()->document($entityId); // get document ID
 $response = $api->dunning()->document($entityId, true); // get file content
-$response = $api->dunning()->document($entityId, true, 'image/*'); // accept only images
 ```
 
 ### Event Subscriptions Endpooint
@@ -177,10 +189,13 @@ $response = $api->invoice()->create($data);
 $response = $api->invoice()->create($data, true); // finalized
 $response = $api->invoice()->pursue($precedingSalesVoucherId, $data);
 $response = $api->invoice()->pursue($precedingSalesVoucherId, $data, true); // finalized
+$response = $api->invoice()->file($entityId); // get file content
+$response = $api->invoice()->file($entityId, 'application/xml'); // as XRechnung
+
+// deprecated methods:
 $response = $api->invoice()->document($entityId); // get document ID
 $response = $api->invoice()->document($entityId, true); // get file content
-$response = $api->invoice()->document($entityId, true, 'image/*'); // accept only images
-$response = $api->invoice()->document($entityId, true, 'application/xml'); // get XRechung XML File (if possible)
+$response = $api->invoice()->document($entityId, true, 'application/xml'); // as XRechung XML File
 ```
 
 ### Order Confirmation Endpoint
@@ -189,9 +204,11 @@ $voucherList = $api->orderConfirmation()->getVoucherListClient(); // see Voucher
 $response = $api->orderConfirmation()->get($entityId);
 $response = $api->orderConfirmation()->create($data);
 $response = $api->orderConfirmation()->pursue($precedingSalesVoucherId, $data);
+$response = $api->orderConfirmation()->file($entityId); // get file content
+
+// deprecated methods:
 $response = $api->orderConfirmation()->document($entityId); // get document ID
 $response = $api->orderConfirmation()->document($entityId, true); // get file content
-$response = $api->orderConfirmation()->document($entityId, true, 'image/*'); // accept only images
 ```
 
 ### Payment  Endpoint
@@ -225,9 +242,11 @@ $voucherList = $api->quotation()->getVoucherListClient(); // see VoucherlistClie
 $response = $api->quotation()->get($entityId);
 $response = $api->quotation()->create($data);
 $response = $api->quotation()->create($data, true); // finalized
+$response = $api->quotation()->file($entityId); // get file content
+
+// deprecated methods:
 $response = $api->quotation()->document($entityId); // get document ID
 $response = $api->quotation()->document($entityId, true); // get file content
-$response = $api->quotation()->document($entityId, true, 'image/*'); // accept only images
 ```
 
 ### Recurring Templates Endpoint
@@ -252,10 +271,6 @@ $response = $api->recurringTemplate()->get($entityId);
 $response = $api->voucher()->get($entityId);
 $response = $api->voucher()->create($data);
 $response = $api->voucher()->update($entityId, $data);
-$response = $api->voucher()->document($entityId); // get document ID
-$response = $api->voucher()->document($entityId, true); // get file content
-$response = $api->voucher()->document($entityId, true, 'image/*'); // accept only images
-$response = $api->voucher()->document($entityId, true, 'application/xml'); // get XRechung XML File (if possible)
 $response = $api->voucher()->upload($entitiyId, $filepath);
 ```
 
@@ -304,7 +319,7 @@ $client->updatedDateTo = new \DateTime('2023-12-01');
 $response = $client->getPage(0);
 ```
 
-## Utils 
+## Utils
 
 ### get JSON from Success and Error Response