Many auction platforms also offer a buy-now option: the distributor sets the item at a fixed price and there are no bids. In these situations, an online sales contract is negotiated normally: accepted by the merchant`s offer and by the customer. There are still exceptions, that is, when the order error is the fault of the seller. This is the case when an order form is confusing or ambiguous or when a faulty order may be related to input errors. The last points are covered by the specific obligations that any merchant who carries out online commerce must fulfill (see below). On auction platforms like eBay, merchants sell their products at auction or offer an instant purchase option, and on sites like MyHammer, merchants can also offer services.