Receipt of goods means having goods in possession.
Seller means a person who sells or contracts to sell goods.
The offer can be revoked at any time until performance called for is completed. In Petterson, Pattberg agrees Petterson to accept a smaller amount than the total mortgage debt if Petterson agrees to pay it within a specific time provided. However, when Petterson came to pay off the mortgage, Pattberg refused to accept the payment. The court held even though Petterson tried to pay an installment in the time offered, there was no contract because an offer was withdrawn by Pattberg before it was accepted. This is so called an Option contract as an offeree has an option to perform or not to.