diff --git a/README.md b/README.md
index c532a9e..4329e5a 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,7 @@ Parameter | Example | Explanation
 `returnIp` | `true` / false | enables return of result if a record was changed
 `allowCreate` | true/`false` | allows creation of entries if parameter `create=true` in URL
 `restrictDomain` | true / `false` | allows admin to restrict the domain to update to a given value `domain` and/or `host`. See URL parameters for host parameter explanation
+`allowNetcupCreds` | true / `false` | allows the user to pass netcup credentials directly via the URL. URL creds will be preferred if any still exist in .env file
 
 * alternatively you can use .configure.sh to create your .env file for you (if you are on a *NIX system)
 
@@ -60,6 +61,9 @@ txt | acme-challenge-text | the content to update an existing TXT record
 force | true | ignore checking if the record needs to be updated, just do it anyways. Default: `false`
 mode | * | `case B)` If domain is your registered domain "example.com". Possible values: `*` or `both`. Default: `@`
 create | true | create all entries if none exist. e.g. will not create A if AAAA exists. Needs `allowCreate=true` in .env
+customerId | 12345 | uses the URL provided credentials instead of the ones stored in .env. Needs `allowNetcupCreds=true` in .env
+apiKey | 12345 | uses the URL provided credentials instead of the ones stored in .env. Needs `allowNetcupCreds=true` in .env
+apiPassword | 12345 | uses the URL provided credentials instead of the ones stored in .env. Needs `allowNetcupCreds=true` in .env
 
 
 
diff --git a/src/Config.php b/src/Config.php
index aa85c5c..42c3ad2 100644
--- a/src/Config.php
+++ b/src/Config.php
@@ -55,6 +55,11 @@ final class Config
      */
     private $allowCreate = false;
 
+    /**
+     * @var bool
+     */
+    private $allowNetcupCreds = false;
+
     /**
      * @var bool
      */
@@ -88,9 +93,16 @@ final class Config
         return
             !empty($this->username) &&
             !empty($this->password) &&
-            !empty($this->apiKey) &&
-            !empty($this->apiPassword) &&
-            !empty($this->customerId) &&
+            (
+                (
+                    !empty($this->apiKey) &&
+                    !empty($this->apiPassword) &&
+                    !empty($this->customerId)
+                ) ||
+                (
+                    $this->isAllowNetcupCreds()
+                )
+            ) &&
             !empty($this->logFile);
     }
 
@@ -182,6 +194,14 @@ final class Config
         return $this->restrictDomain;
     }
 
+    /**
+     * @return bool
+     */
+    public function isAllowNetcupCreds()
+    {
+        return $this->allowNetcupCreds;
+    }
+
     /**
      * @return string
      */
diff --git a/src/Handler.php b/src/Handler.php
index 9882782..0b4a6af 100644
--- a/src/Handler.php
+++ b/src/Handler.php
@@ -21,6 +21,21 @@ final class Handler
      */
     private $payload;
 
+    /**
+     * @var int
+     */
+    private $customerid;
+
+    /**
+     * @var string
+     */
+    private $apikey;
+
+    /**
+     * @var string
+     */
+    private $apipassword;
+
     public function __construct(array $config, array $payload)
     {
         $this->config = new Config($config);
@@ -54,6 +69,21 @@ final class Handler
             }
         }
 
+        if ($this->config->isAllowNetcupCreds()) {
+            if ($this->payload->isValidNetcupCreds()) {
+                if ($this->config->isDebug()) {
+                    $this->doLog('received valid Netcup credentials');
+                }
+            }
+            $this->customerid = $this->payload->getCustomerId();
+            $this->apikey = $this->payload->getApiKey();
+            $this->apipassword = $this->payload->getApiPassword();
+        } else {
+            $this->customerid = $this->config->getCustomerId();
+            $this->apikey = $this->config->getApiKey();
+            $this->apipassword = $this->config->getApiPassword();
+        }
+
         if (is_readable($this->config->getLogFile())) {
             $this->log = json_decode(file_get_contents($this->config->getLogFile()), true);
         } else {
@@ -112,9 +142,9 @@ final class Handler
         $dnsClient = new Soap\DomainWebserviceSoapClient();
 
         $loginHandle = $dnsClient->login(
-            $this->config->getCustomerId(),
-            $this->config->getApiKey(),
-            $this->config->getApiPassword(),
+            $this->customerid,
+            $this->apikey,
+            $this->apipassword,
             $clientRequestId
         );
 
@@ -139,8 +169,8 @@ final class Handler
 
         $infoHandle = $dnsClient->infoDnsRecords(
             $updateDomainName,
-            $this->config->getCustomerId(),
-            $this->config->getApiKey(),
+            $this->customerid,
+            $this->apikey,
             $loginHandle->responsedata->apisessionid,
             $clientRequestId
         );
@@ -231,8 +261,8 @@ final class Handler
 
             $dnsClient->updateDnsRecords(
                 $updateDomainName,
-                $this->config->getCustomerId(),
-                $this->config->getApiKey(),
+                $this->customerid,
+                $this->apikey,
                 $loginHandle->responsedata->apisessionid,
                 $clientRequestId,
                 $newRecordSet
@@ -248,8 +278,8 @@ final class Handler
 
             $dnsClient->updateDnsRecords(
                 $updateDomainName,
-                $this->config->getCustomerId(),
-                $this->config->getApiKey(),
+                $this->customerid,
+                $this->apikey,
                 $loginHandle->responsedata->apisessionid,
                 $clientRequestId,
                 $recordSet
@@ -261,8 +291,8 @@ final class Handler
         }
 
         $logoutHandle = $dnsClient->logout(
-            $this->config->getCustomerId(),
-            $this->config->getApiKey(),
+            $this->customerid,
+            $this->apikey,
             $loginHandle->responsedata->apisessionid,
             $clientRequestId
         );
diff --git a/src/Payload.php b/src/Payload.php
index 3e1776d..066465d 100644
--- a/src/Payload.php
+++ b/src/Payload.php
@@ -44,6 +44,21 @@ final class Payload
      */
     private $host;
 
+    /**
+     * @var int
+     */
+    private $customerId;
+
+    /**
+     * @var string
+     */
+    private $apiKey;
+
+    /**
+     * @var string
+     */
+    private $apiPassword;
+
     /**
      * @var bool
      */
@@ -85,6 +100,41 @@ final class Payload
             );
     }
 
+    /**
+     * @return bool
+     */
+    public function isValidNetcupCreds()
+    {
+        return
+            !empty($this->customerId) &&
+            !empty($this->apiKey) &&
+            !empty($this->apiPassword);
+    }
+
+    /**
+     * @return int
+     */
+    public function getCustomerId()
+    {
+        return $this->customerId;
+    }
+
+    /**
+     * @return string
+     */
+    public function getapiKey()
+    {
+        return $this->apiKey;
+    }
+
+    /**
+     * @return string
+     */
+    public function getApiPassword()
+    {
+        return $this->apiPassword;
+    }
+
     /**
      * @return string
      */