public function adminBuyerIndex(User $user, Offer $offer, CouponGallery $service, Coupon $coupon)
{
$buyers = $coupon->coupon_user()->paginate(20);
return view('admin.offer.service.coupon.buyer.index', compact('user', 'offer', 'service', 'coupon', 'buyers'))->with(['title' => 'Coupon Buyers Management']);
}