400 error when sending refundPayment request

[xotnet]

I discovered an issue with BotAPI. When sending a refundPayment request for a payment made as part of a recurring subscription, the API responds with a 400 error and the message:
{"ok":false,"error_code":400,"description":"Bad Request: CHARGE_ALREADY_REFUNDED"}
However, the refund itself is processed successfully. The problem lies in the incorrect server response: the bot does not display any notification about the refund, and the stars are simply returned to the user's account without any message or confirmation.