diff --git a/README.md b/README.md
index a2c9f9a..5e44c1b 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,8 @@ composer require wunderio/drupal-ping:^2
 
 ### v2.3
 
-- Refactor error messages into JSON for easier automation.
+- Refactor error messages into JSON for easier automation
+- Refactor debug token generation
 
 ### v2.2
 
@@ -55,9 +56,9 @@ Breaking Changes!
 ## Usage
 
 * Visit `/_ping.php` to get a system status
-* By using `?debug=token` additional status check table and time profiling information is displayed.
-  * See [Ping Development & Testing](#ping-development--testing) how to obtain the `token` value.
-* Find slow checks and checks errors in logs.
+* By using `?debug=token` additional status check table and time profiling information is displayed
+  * See [Debug Mode](#debug-mode) how to obtain the `token` value
+* Find slow checks and checks errors in logs
 
 ## Checks
 
@@ -132,6 +133,23 @@ Use of `$status->setName()` and `$status->set()` to define the result.
 The PHP file does not need to contain functions, just plain PHP is enough.
 Check it out how other checks are created in the `_ping.php`.
 
+## Debug Mode
+
+`_ping.php` can be accessed over the web.
+For example `https://example.com/_ping.php`.
+It can also be accessed from the shell `cd /path/web ; php _ping.php`.
+From the shell output the debug token can be attained.
+Then visit the ping again with `https://example.com/_ping.php?debug=token`.
+
+The token is generated in one of the following ways.
+These methods are listed by precedance.
+If earlier fails (is empty), then next one is tried.
+* Drupal settings `$settings['ping_token']`
+* Environment variable `PING_TOKEN`
+* Md5 of the combination of environment variable values where the variable names matches regex `/^(DB|ENVIRONMENT_NAME|GIT|PHP|PROJECT_NAME|S+MTP|VARNISH|WARDEN)/`
+* Md5 of Drupal settings `$settings['hash_salt']`
+* Md5 of the hostname
+
 ## Ping Development & Testing
 
 - `lando install` - Install dev dependencies without Drupal
@@ -143,11 +161,6 @@ Note: the Lando setup is defined so that D7 and D89 branched can be easily switc
 both running their own own setup. Drupal and composer installations wont clash.
 They have separate dirs.
 
-`_ping.php` can be accessed over the lando url.
-For example `http://localhost:51418/_ping.php`.
-It can also be accessed from the shell `cd /app/drupal9/web ; php _ping.php`.
-From the shell output the debug token can be attained.
-
 ## Maintainers
 
 - [Janne Koponen](https://github.com/tharna)
diff --git a/_ping.php b/_ping.php
index 0d860bd..b643487 100644
--- a/_ping.php
+++ b/_ping.php
@@ -125,15 +125,15 @@ public function run(): void {
     // if mod_php fails and then matching the string.
     print "$msg $code" . PHP_EOL;
 
-    $code = $this->getDebugCode($settings);
-    if (!$this->isDebug($code) && !$this->isCli()) {
+    $token = $this->getToken($settings);
+    if (!$this->isDebug($token) && !$this->isCli()) {
       return;
     }
 
     if ($this->isCli()) {
       print <<<TXT
 
-<p>Debug code: $code</p>
+<p>Debug token: $token</p>
 
 TXT;
     }
@@ -315,7 +315,7 @@ public function logErrors(array $payloads): void {
   }
 
   /**
-   * Compute Debug Code.
+   * Provide Debug Access Token.
    *
    * This is needed to limit access to debug info over the web.
    * Many methods are tried in sequence to define the code.
@@ -324,46 +324,47 @@ public function logErrors(array $payloads): void {
    *   The Drupal settings.
    *
    * @return string
-   *   Access code.
+   *   Access token.
    */
-  public function getDebugCode(array $settings): string {
+  public function getToken(array $settings): string {
 
-    // $settings['ping_debug'].
-    if (!empty($settings['ping_debug'])) {
-      $code = $settings['ping_debug'];
-      return $code;
+    // $settings['ping_token'].
+    if (!empty($settings['ping_token'])) {
+      $token = $settings['ping_token'];
+      return $token;
     }
 
-    // Echo "$PROJECT_NAME-$ENVIRONMENT_NAME" | md5sum.
-    if (!empty(getenv('SILTA_CLUSTER'))) {
-      $proj = getenv('PROJECT_NAME');
-      $env = getenv('ENVIRONMENT_NAME');
-      $code = md5("$proj-$env");
-      return $code;
+    // Env(PING_TOKEN).
+    if (!empty(getenv('PING_TOKEN'))) {
+      $token = (string) getenv('PING_TOKEN');
+      return $token;
     }
 
-    // Echo "$DB_HOST_DRUPAL-$DB_NAME_DRUPAL-$DB_PASS_DRUPAL-$DB_PORT_DRUPAL-$DB_USER_DRUPAL"
-    // | md5sum.
-    if (!empty(getenv('DB_NAME_DRUPAL'))) {
-      $host = getenv('DB_HOST_DRUPAL');
-      $name = getenv('DB_NAME_DRUPAL');
-      $pass = getenv('DB_PASS_DRUPAL');
-      $port = getenv('DB_PORT_DRUPAL');
-      $user = getenv('DB_USER_DRUPAL');
-      $code = md5("$host-$name-$pass-$port-$user");
-      return $code;
+    // Md5(Concatenated-values-of-some-env-variables).
+    $token = [];
+    $env = getenv();
+    ksort($env);
+    foreach ($env as $key => $value) {
+      if (preg_match('/^(DB|ENVIRONMENT_NAME|GIT|PHP|PROJECT_NAME|S+MTP|VARNISH|WARDEN)/', $key)) {
+        $token[] = $value;
+      }
+    }
+    if (!empty($token)) {
+      $token = implode('-', $token);
+      $token = md5($token);
+      return $token;
     }
 
     // Md5($settings['hash_salt']).
     if (!empty($settings['hash_salt'])) {
-      $code = md5($settings['hash_salt']);
-      return $code;
+      $token = md5($settings['hash_salt']);
+      return $token;
     }
 
-    // Hostname | md5sum.
-    $code = gethostname();
-    $code = md5($code);
-    return $code;
+    // Md5(Hostname).
+    $token = gethostname();
+    $token = md5($token);
+    return $token;
   }
 
   /**
@@ -380,15 +381,15 @@ public function isCli(): bool {
   /**
    * Detect if debug information should be provided on request.
    *
-   * Currently it is matching '?debug=code'
+   * Currently it is matching '?debug=token'
    *
-   * @param string $code
-   *   The code to be checked if present in the request.
+   * @param string $token
+   *   The token to be checked if present in the request.
    *
    * @return bool
    *   Return if we need to emit debugging info.
    */
-  public function isDebug(string $code): bool {
+  public function isDebug(string $token): bool {
 
     // @codingStandardsIgnoreLine DrupalPractice.Variables.GetRequestData.SuperglobalAccessedWithVar
     $debug = $_GET['debug'] ?? NULL;
@@ -396,7 +397,7 @@ public function isDebug(string $code): bool {
       return FALSE;
     }
 
-    return $debug == $code;
+    return $debug == $token;
   }
 
 }
diff --git a/tests/AppTest.php b/tests/AppTest.php
index be1655e..7bc1de5 100644
--- a/tests/AppTest.php
+++ b/tests/AppTest.php
@@ -11,6 +11,15 @@ public static function setUpBeforeClass(): void {
     require_once 'init.php';
   }
 
+  protected function setUp(): void {
+    // Cleanup env before every test
+    foreach (getenv() as $key => $value) {
+      if (preg_match('/^(DB|ENVIRONMENT_NAME|GIT|PHP|PROJECT_NAME|S+MTP|VARNISH|WARDEN)/', $key)) {
+        putenv($key);
+      }
+    }
+  }
+
   /**
    * @covers ::__construct
    */
@@ -85,69 +94,67 @@ public function testProfile2logs(): void {
   }
 
   /**
-   * @covers ::getDebugCode
+   * @covers ::getToken
    */
-  public function testGetDebugCodePingDebug(): void {
+  public function testGetTokenSettings(): void {
     $a = new App();
-    $code = '1234';
-    $settings = ['ping_debug' => $code];
-    $data = $a->getDebugCode($settings);
-    $this->assertEquals($code, $data);
+    $token = '1234';
+    $settings = ['ping_token' => $token];
+    $data = $a->getToken($settings);
+    $this->assertEquals($token, $data);
   }
 
   /**
-   * @covers ::getDebugCode
+   * @covers ::getToken
    */
-  public function testGetDebugCodeSilta(): void {
+  public function testGetTokenEnvToken(): void {
+    $token = '1234';
+    putenv("PING_TOKEN=$token");
     $a = new App();
-    putenv('SILTA_CLUSTER=1');
-    putenv('PROJECT_NAME=a');
-    putenv('ENVIRONMENT_NAME=b');
-    $settings = [];
-    $data = $a->getDebugCode($settings);
-    putenv('SILTA_CLUSTER');
-    putenv('PROJECT_NAME');
-    putenv('ENVIRONMENT_NAME');
-    $this->assertEquals('8ca2ed590cf2ea2404f2e67641bcdf50', $data);
+    $data = $a->getToken([]);
+    $this->assertEquals($token, $data);
   }
 
   /**
-   * @covers ::getDebugCode
+   * @covers ::getToken
    */
-  public function testGetDebugCodeVirtualServer(): void {
+  public function testGetTokenEnv(): void {
     $a = new App();
-    putenv('DB_HOST_DRUPAL=host');
-    putenv('DB_NAME_DRUPAL=name');
-    putenv('DB_PASS_DRUPAL=pass');
-    putenv('DB_PORT_DRUPAL=port');
-    putenv('DB_USER_DRUPAL=user');
+    foreach ([
+      'DB_NAME',
+      'ENVIRONMENT_NAME',
+      'GIT_TEST',
+      'PHP_TEST',
+      'PROJECT_NAME',
+      'SMTP',
+      'SSMTP',
+      'VARNISH_TEST',
+      'WARDEN_TEST',
+    ] as $key) {
+      putenv("$key=test");
+    }
     $settings = [];
-    $data = $a->getDebugCode($settings);
-    putenv('DB_HOST_DRUPAL');
-    putenv('DB_NAME_DRUPAL');
-    putenv('DB_PASS_DRUPAL');
-    putenv('DB_PORT_DRUPAL');
-    putenv('DB_USER_DRUPAL');
-    $this->assertEquals('9ea396789d54a514eb63e12126c5ae4a', $data);
+    $data = $a->getToken($settings);
+    $this->assertEquals('7c3df2116154d33f51c6d77db9aa3dbc', $data);
   }
 
   /**
-   * @covers ::getDebugCode
+   * @covers ::getToken
    */
-  public function testGetDebugCodeHashSalt(): void {
+  public function testGetTokenHashSalt(): void {
     $a = new App();
     $settings = ['hash_salt' => 'qwertyuiop'];
-    $data = $a->getDebugCode($settings);
+    $data = $a->getToken($settings);
     $this->assertEquals('6eea9b7ef19179a06954edd0f6c05ceb', $data);
   }
 
   /**
-   * @covers ::getDebugCode
+   * @covers ::getToken
    */
-  public function testGetDebugCodeHostName(): void {
+  public function testGetTokenHostName(): void {
     $a = new App();
     $settings = [];
-    $data = $a->getDebugCode($settings);
+    $data = $a->getToken($settings);
     $this->assertEquals(md5(gethostname()), $data);
   }