If it's for you, it's no big problem. If the merchant fails to settle the money with the bank, he may take the initiative to contact you and make it up again.
If not, the landlord can also cooperate with you to brush it again. At that time, if you received two sums of money, you can also call the bank to reflect. The bank can apply to the merchant to adjust the bill for you, because there is no POS bill for the first payment, that is, without your signature, the money will naturally be refunded to you.