/**
* This method add a coupon
*
* @param string $couponName
* @return Response
*/
public function add($couponName)
{
$couponName = strtolower($couponName);
$coupon = Coupon::findByCode($couponName);
if (!$coupon) {
return redirect()->route('cart.index');
}
Cart::addCoupon($couponName, $coupon->discount);
return redirect()->route('cart.index');
}
