diff --git a/classes/db.php b/classes/db.php
index 42f2f9fe..9d9940cd 100644
--- a/classes/db.php
+++ b/classes/db.php
@@ -108,4 +108,9 @@ class db
     {
         return $this->conn->prepare($sql);
     }
+
+    public function num_rows(\mysqli_result|bool $result): int|string
+    {
+        return $result->num_rows;
+    }
 }
\ No newline at end of file
diff --git a/classes/redis.php b/classes/redis.php
index 1fc48b6b..8fc2fb03 100644
--- a/classes/redis.php
+++ b/classes/redis.php
@@ -108,4 +108,33 @@ class redis implements redis_i
         $this->delete('department_webhook_' . $department_id);
         return $this;
     }
+
+    /**
+     * @inheritDoc
+     */
+    public function cache_department_name(int $department_id, string $department_name): self
+    {
+        // Cache the department name
+        $this->set('department_name_' . $department_id, $department_name);
+        return $this;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function get_department_name(int $department_id): string|null
+    {
+        // Get the department name
+        return $this->get('department_name_' . $department_id);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function clear_department_name(int $department_id): self
+    {
+        // Clear the department name
+        $this->delete('department_name_' . $department_id);
+        return $this;
+    }
 }
\ No newline at end of file
diff --git a/classes/slack.php b/classes/slack.php
index 1fe9b39a..adc5a59d 100644
--- a/classes/slack.php
+++ b/classes/slack.php
@@ -5,6 +5,7 @@ namespace classes;
 use GuzzleHttp\Client;
 use interfaces\notification_i;
 use objects\departments_o;
+use objects\users_o;
 use traits\notification_t;
 
 
@@ -78,4 +79,28 @@ class slack implements notification_i
             return 'Failed to send message: ' . $e->getMessage();
         }
     }
+
+    public function format_new_booking($id, $customer_number, string $wash_type, string $contact_email, string $reference_number, string $regNrTraekker, string $regNrTrailer, string $washCertificateEmail, string $date, int $department, $pickup_bool, string $notes, string $washCertificateStatus, string $washCertificateUrl, string $status): string
+    {
+        // Get the department name
+        $department_name = (new departments_o())->getDepartmentName($department);
+        // Get the customer name
+        $customer_name = (new users_o())->getCustomerName($customer_number);
+        // Format the message
+        return "New booking created\n"
+            . "ID: $id\n"
+            . "Customer: $customer_name\n"
+            . "Customer number: $customer_number\n"
+            . "Wash type: $wash_type\n"
+            . "Contact email: $contact_email\n"
+            . "Reference number: $reference_number\n"
+            . "RegNr Traekker: $regNrTraekker\n"
+            . "RegNr Trailer: $regNrTrailer\n"
+            . "Wash certificate email: $washCertificateEmail\n"
+            . "Date: $date\n"
+            . "Department: $department_name\n"
+            . "Pickup: $pickup_bool\n"
+            . "Notes: $notes\n"
+            . "Status: $status";
+    }
 }
\ No newline at end of file
diff --git a/index.php b/index.php
index 85879f70..d4c41558 100644
--- a/index.php
+++ b/index.php
@@ -1,4 +1,5 @@
-<?php global $DEBUG, $CONFIG_DB, $ENCRYPTION_KEY, $CORS, $WD, $db, $response, $request, $router, $redis;
+<?php global /** @var response $response */
+$DEBUG, $CONFIG_DB, $ENCRYPTION_KEY, $CORS, $WD, $db, $response, $request, $router, $redis;
 /**
  * This is the main entry point to the Truck Wash API.
  */
diff --git a/interfaces/redis_i.php b/interfaces/redis_i.php
index ea268dac..043a9d35 100644
--- a/interfaces/redis_i.php
+++ b/interfaces/redis_i.php
@@ -69,4 +69,26 @@ interface redis_i
      * @return self
      */
     public function clear_department_webhook(int $department_id): self;
+
+    /**
+     * Cache a department name
+     * @param int $department_id
+     * @param string $department_name
+     * @return self
+     */
+    public function cache_department_name(int $department_id, string $department_name): self;
+
+    /**
+     * Get a department name
+     * @param int $department_id
+     * @return string|null
+     */
+    public function get_department_name(int $department_id): string|null;
+
+    /**
+     * Clear a department name
+     * @param int $department_id
+     * @return self
+     */
+    public function clear_department_name(int $department_id): self;
 }
\ No newline at end of file
diff --git a/objects/bookings_o.php b/objects/bookings_o.php
index 3818e493..327a96e8 100644
--- a/objects/bookings_o.php
+++ b/objects/bookings_o.php
@@ -5,6 +5,7 @@ namespace objects;
 use classes\db;
 use classes\object_property;
 use classes\response;
+use classes\slack;
 use traits\db_object_t;
 
 class bookings_o extends db
@@ -31,6 +32,74 @@ class bookings_o extends db
         $this->setTable('bookings');
     }
 
+    public function addOrUpdate($id, $customer_number, $wash_type, $contact_email, $reference_number, $regNrTraekker, $regNrTrailer, $washCertificateEmail, $date, $department, $pickup_bool, $notes, $washCertificateStatus, $washCertificateUrl, $status): void
+    {
+        global $db;
+        // Avoid SQL injection
+        $wash_type = $db->escape_string($wash_type);
+        $contact_email = $db->escape_string($contact_email);
+        $reference_number = $db->escape_string($reference_number);
+        $regNrTraekker = $db->escape_string($regNrTraekker);
+        $regNrTrailer = $db->escape_string($regNrTrailer);
+        $washCertificateEmail = $db->escape_string($washCertificateEmail);
+        $date = $db->escape_string($date);
+        // Parse the department name to id
+        $department = $this->getDepartmentIdByLegacyName($department);
+        $notes = $db->escape_string($notes);
+        $washCertificateStatus = $db->escape_string($washCertificateStatus);
+        $washCertificateUrl = $db->escape_string($washCertificateUrl);
+        $status = $db->escape_string($status);
+        // Check if the entry already exists
+        $sql = "SELECT * FROM $this->table WHERE id = $id";
+        $result = $db->query($sql);
+        if ($db->num_rows($result) === 0) {
+            // Send a department webhook if the booking is new
+            $slack = new slack();
+            try {
+                $slack->send_department_booking_notification($department, $slack->format_new_booking(
+                    $id,
+                    $customer_number,
+                    $wash_type,
+                    $contact_email,
+                    $reference_number,
+                    $regNrTraekker,
+                    $regNrTrailer,
+                    $washCertificateEmail,
+                    $date,
+                    $department,
+                    $pickup_bool,
+                    $notes,
+                    $washCertificateStatus,
+                    $washCertificateUrl,
+                    $status
+                ));
+            } catch (\Exception $e) {
+                // Log the error
+                $logs = new logs_o();
+                $logs->add('slack', 0, 3, 0, 'SEND_DEPARTMENT_BOOKING_NOTIFICATION', $e->getMessage());
+            }
+        }
+        // Create a new record in the database ( Replace the code, if an entry already exists )
+        $sql = "INSERT INTO $this->table (id, customer_number, wash_type, contact_email, reference_number, regNrTraekker, regNrTrailer, washCertificateEmail, date, department, pickup_bool, notes, washCertificateStatus, washCertificateUrl, status) VALUES ($id, $customer_number, '$wash_type', '$contact_email', '$reference_number', '$regNrTraekker', '$regNrTrailer', '$washCertificateEmail', '$date', '$department', $pickup_bool, '$notes', '$washCertificateStatus', '$washCertificateUrl', '$status') ON DUPLICATE KEY UPDATE customer_number = $customer_number, wash_type = '$wash_type', contact_email = '$contact_email', reference_number = '$reference_number', regNrTraekker = '$regNrTraekker', regNrTrailer = '$regNrTrailer', washCertificateEmail = '$washCertificateEmail', date = '$date', department = '$department', pickup_bool = $pickup_bool, notes = '$notes', washCertificateStatus = '$washCertificateStatus', washCertificateUrl = '$washCertificateUrl', status = '$status'";
+        $db->query($sql);
+        // Clear the cache
+        redis->clear_department_booking_count($department);
+    }
+
+    public function getDepartmentIdByLegacyName(string $departmentName): int
+    {
+        // Get the department id by the legacy name
+        $departmentLegacyNames = [
+            'køge' => 4,
+            'taastrup' => 2,
+            'aarhusc' => 5,
+            'roskilde' => 6,
+            'hvidovre' => 1,
+            'glostrup' => 3,
+        ];
+        return $departmentLegacyNames[strtolower($departmentName)] ?? 0;
+    }
+
     public function add(int $customer_number, string $wash_type, string $contact_email, string $reference_number, string $regNrTraekker, string $regNrTrailer, string $washCertificateEmail, string $date, string $department, int $pickup_bool, string $notes, string $washCertificateStatus, string $washCertificateUrl, string $status): void
     {
         global $db;
@@ -58,44 +127,6 @@ class bookings_o extends db
         $this->id = $db->insert_id();
     }
 
-    public function getDepartmentIdByLegacyName(string $departmentName): int
-    {
-        // Get the department id by the legacy name
-        $departmentLegacyNames = [
-            'køge' => 4,
-            'taastrup' => 2,
-            'aarhusc' => 5,
-            'roskilde' => 6,
-            'hvidovre' => 1,
-            'glostrup' => 3,
-        ];
-        return $departmentLegacyNames[strtolower($departmentName)] ?? 0;
-    }
-
-    public function addOrUpdate($id, $customer_number, $wash_type, $contact_email, $reference_number, $regNrTraekker, $regNrTrailer, $washCertificateEmail, $date, $department, $pickup_bool, $notes, $washCertificateStatus, $washCertificateUrl, $status): void
-    {
-        global $db;
-        // Avoid SQL injection
-        $wash_type = $db->escape_string($wash_type);
-        $contact_email = $db->escape_string($contact_email);
-        $reference_number = $db->escape_string($reference_number);
-        $regNrTraekker = $db->escape_string($regNrTraekker);
-        $regNrTrailer = $db->escape_string($regNrTrailer);
-        $washCertificateEmail = $db->escape_string($washCertificateEmail);
-        $date = $db->escape_string($date);
-        // Parse the department name to id
-        $department = $this->getDepartmentIdByLegacyName($department);
-        $notes = $db->escape_string($notes);
-        $washCertificateStatus = $db->escape_string($washCertificateStatus);
-        $washCertificateUrl = $db->escape_string($washCertificateUrl);
-        $status = $db->escape_string($status);
-        // Create a new record in the database ( Replace the code, if an entry already exists )
-        $sql = "INSERT INTO $this->table (id, customer_number, wash_type, contact_email, reference_number, regNrTraekker, regNrTrailer, washCertificateEmail, date, department, pickup_bool, notes, washCertificateStatus, washCertificateUrl, status) VALUES ($id, $customer_number, '$wash_type', '$contact_email', '$reference_number', '$regNrTraekker', '$regNrTrailer', '$washCertificateEmail', '$date', '$department', $pickup_bool, '$notes', '$washCertificateStatus', '$washCertificateUrl', '$status') ON DUPLICATE KEY UPDATE customer_number = $customer_number, wash_type = '$wash_type', contact_email = '$contact_email', reference_number = '$reference_number', regNrTraekker = '$regNrTraekker', regNrTrailer = '$regNrTrailer', washCertificateEmail = '$washCertificateEmail', date = '$date', department = '$department', pickup_bool = $pickup_bool, notes = '$notes', washCertificateStatus = '$washCertificateStatus', washCertificateUrl = '$washCertificateUrl', status = '$status'";
-        $db->query($sql);
-        // Clear the cache
-        redis->clear_department_booking_count($department);
-    }
-
     public function getCustomerBookingsPaginated(int $customer_number, int $page = 1, int $limit = 10, array $order = ['id' => 'DESC'], string $search = null, array $filters = null): array
     {
         global /** @var response $response */
diff --git a/objects/departments_o.php b/objects/departments_o.php
index 93ded757..4589ca5a 100644
--- a/objects/departments_o.php
+++ b/objects/departments_o.php
@@ -147,4 +147,21 @@ class departments_o extends db
         $this->getObjectProperties();
         return $this;
     }
+
+    public function getDepartmentName(int $department): string
+    {
+        global $db;
+        // Check if the department name is cached
+        $name = redis->get_department_name($department);
+        // If the department name is not cached, get it from the database
+        if ($name === null) {
+            $sql = "SELECT name FROM $this->table WHERE id = $department";
+            $result = $db->query($sql);
+            $result = $db->fetch_assoc($result);
+            $name = $result['name'];
+            // Cache the department name
+            redis->cache_department_name($department, $name);
+        }
+        return redis->get_department_name($department);
+    }
 }
\ No newline at end of file
diff --git a/objects/users_o.php b/objects/users_o.php
index 21487260..cc8688ce 100644
--- a/objects/users_o.php
+++ b/objects/users_o.php
@@ -642,6 +642,19 @@ class users_o extends db
         return false;
     }
 
+    public function parseUsers(array $listObjectsWithPaginationIfSet): array
+    {
+        return self::parseCustomerNumbers($listObjectsWithPaginationIfSet);
+    }
+
+    public function parseCustomerNumbers(array $listObjectsWithPaginationIfSet): array
+    {
+        foreach ( $listObjectsWithPaginationIfSet as $key => $value ) {
+            $listObjectsWithPaginationIfSet[$key]['customer_name'] = $this->getCustomerName($value['customer_number']);
+        }
+        return $listObjectsWithPaginationIfSet;
+    }
+
     public function getCustomerName(int $customer_number): string|null
     {
         // Check if the customer name is cached
@@ -652,7 +665,7 @@ class users_o extends db
         $economic = new economicCustomers();
         $customer_name = $economic->getCustomerName($customer_number);
         // Cache the customer name
-        redis->cache_economic_customer_name($customer_number, $customer_name);
+        redis->cache_economic_customer_name($customer_number, $customer_name ?? '');
         return $customer_name;
     }
 }
\ No newline at end of file
diff --git a/routes/usersRoute.php b/routes/usersRoute.php
index 871764e4..fc24909a 100644
--- a/routes/usersRoute.php
+++ b/routes/usersRoute.php
@@ -3,6 +3,7 @@
 namespace routes;
 
 use classes\authentication;
+use classes\response;
 use objects\logs_o;
 use objects\users_o;
 use traits\route_t;
@@ -15,7 +16,8 @@ class usersRoute
     {
         $this->get('/users', function () {
             // Require the user to be logged in
-            global $response;
+            global /** @var response $response */
+            $response;
             $this->requirePermission('list_users');
             // Get the user object
             $user = (new authentication())->get_user();
@@ -24,8 +26,9 @@ class usersRoute
                 // Log the incident
                 (new logs_o())->add('users', 'global', 1, $user->id, 'LIST_USERS', 'Successfully listed users');
                 // Return the list of users
+                $users_o = new users_o();
                 $response->success(
-                    (new users_o())->listObjects()
+                    $users_o->parseUsers($users_o->listObjectsWithPaginationIfSet())
                 );
             } else {
                 // Log the incident