public function invoice($id)
 {
     $transaction = Transaction::findOrFail($id);
     if ($this->user->id == $transaction->user_id) {
         $pdf = storage_path() . '/invoices/' . $transaction->reference_number . '.pdf';
         if (file_exists($pdf)) {
             return Response::download($pdf);
         } else {
             return Redirect::to('clients')->with('error', 'PDF was not found.');
         }
     } else {
         return App::abort(404);
     }
 }
 public function transaction($id)
 {
     $transaction = Transaction::findOrFail($id);
     $pdf = storage_path() . '/invoices/' . $transaction->reference_number . '.pdf';
     if (file_exists($pdf)) {
         return Response::download($pdf);
     } else {
         return Redirect::to('admin/clients')->with('error', 'PDF was not found.');
     }
 }
 /**
  * Display the specified resource.
  *
  * @param  int  $id
  * @return Response
  */
 public function invoice($id)
 {
     $transaction = $this->transaction->findOrFail($id);
     $pdf = storage_path() . '/invoices/' . $transaction->reference_number . '.pdf';
     return Response::download($pdf);
 }