Yes, all orders in the first panel will be done automatically and accurately
Yes, it does not matter if your group or channel is public or private. You can easily register your order
It is not possible to cancel orders in the first panel. But you can register your orders easily and quickly using the Telegram robot @baleozvbot, and you can manage and cancel the order in a completely fair way.
The downside of the various services of the first panel is specified in the product description and also the services are provided in the best possible quality