public function updateExpense($id, $agency, $status)
 {
     if (!($expense = \Contractor::findExpenseById($id))) {
         throw new \Exception("Expense not found", 1);
         return;
     }
     $job = $expense->job;
     if ($agency->id !== $job->agency_id) {
         throw new \Exception("Expense does not belong to the agency.", 1);
         return;
     }
     if ($status) {
         $expense->auth_agency = true;
         $expense->save();
         if ($contractor = $expense->contractor) {
             $notificationData = ['contractor_id' => $contractor->id, 'alert_from' => 'System: Programme Chameleon', 'has_read' => false, 'title' => 'Your expense "' . $expense->title . '" for "' . $job->title . '" has been accepted.', 'description' => 'Accepted by ' . $agency->name, 'url' => '#'];
             \Contractor::addNotification($contractor, $notificationData);
         }
         if (!is_null($job->company_id)) {
             $_hash = new Hash();
             $_hash = $_hash->getHasher();
             if ($company = \Company::findCompanyById($job->company_id)) {
                 $notificationData = ['company_id' => $company->id, 'alert_from' => 'System: Programme Chameleon', 'has_read' => false, 'title' => 'Expense "' . $expense->title . '" for "' . $job->title . '" has been accepted.', 'description' => 'Accepted by ' . $agency->name, 'url' => route('company.job.detail') . '?i=' . $_hash->encode($job->id)];
                 \Company::addNotification($company, $notificationData);
             }
         }
     } else {
         $expense->auth_agency = true;
         $expense->save();
         if ($contractor = $expense->contractor) {
             $notificationData = ['contractor_id' => $contractor->id, 'alert_from' => 'System: Programme Chameleon', 'has_read' => false, 'title' => 'Your expense "' . $expense->title . '" for "' . $job->title . '" has been de-authorized.', 'description' => 'De-authorize by ' . $agency->name, 'url' => '#'];
             \Contractor::addNotification($contractor, $notificationData);
         }
         if (!is_null($job->company_id)) {
             if ($company = \Company::findCompanyById($job->company_id)) {
                 $_hash = new Hash();
                 $_hash = $_hash->getHasher();
                 $notificationData = ['company_id' => $company->id, 'alert_from' => 'System: Programme Chameleon', 'has_read' => false, 'title' => 'Expense "' . $expense->title . '" for "' . $job->title . '" has been de-authorized.', 'description' => 'De-authorize by ' . $agency->name, 'url' => route('agency.job.detail') . '?i=' . $_hash->encode($job->id)];
                 \Company::addNotification($company, $notificationData);
             }
         }
     }
     return $expense;
 }