public async Task <ActionResult> AddCartCoupon(string couponCode)
{
EnsureThatCartExist();
//Need lock to prevent concurrent access to same cart
using (await AsyncLock.GetLockByKey(GetAsyncLockCartKey(WorkContext.CurrentCart)).LockAsync())
{
await _cartBuilder.AddCoupon(couponCode).SaveAsync();
}
return(Json(_cartBuilder.Cart.Coupon));
}