It was clear that there was sufficient inventory that day, but there was no order for payment.

Obviously, the inventory was sufficient that day, but the order payment was not because it could not be bought.

Not a breach of contract. This situation is due to the fact that the goods cannot be purchased due to insufficient inventory at the time of payment, and you can choose to buy other goods.

The seller can cancel the order at any time without paying. If the goods are what shoppers want, it is recommended to contact the seller to inform them. If the seller doesn't operate, all candidates just need to be careful.