"Call to private Instamojo\Instamojo::__construct() from context" in Laravel

public function pay(Request $request){

 $api = new \Instamojo\Instamojo(
   config('services.instamojo.api_key'),
   config('services.instamojo.auth_token'),
   config('services.instamojo.url')
);

try {
$response = $api->paymentRequestCreate(array(
   "purpose" => "FIFA 16",
   "amount" => $request->amount,
   "buyer_name" => "$request->name",
   "send_email" => true,
   "email" => "$request->email",
   "phone" => "$request->mobile_number",
   "redirect_url" => "http://127.0.0.1:8000/pay-success"
   ));
    
   header('Location: ' . $response['longurl']);
   exit();
}catch (Exception $e) {
print('Error: ' . $e->getMessage());
}
}

Error after submitting form on $api = new \Instamojo\Instamojo( line. Error:- Call to private Instamojo\Instamojo::__construct()

via Chebli Mohamed