An Oregon Irrevocable Standby Letter Of Credit (ISOC) is a type of financial instrument issued by a financial institution, such as a bank, to guarantee payment of a debt or obligation. This type of letter of credit is typically used by a business to provide assurance to a supplier or customer that payment will be made. The letter of credit is irrevocable, meaning that the issuer cannot cancel or modify it without the consent of all parties involved. It also generally requires the beneficiary to present evidence of a debt or obligation before the issuing institution can make payment. There are two types of Oregon Irrevocable Standby Letter Of Credit: performance-based Slots and financial Slots. Performance-based Slots are used to guarantee the performance of a contract, such as the completion of a construction project. Financial Slots are used to guarantee payment of a debt or obligation, such as a loan.