A negotiable instrument must contain an order to pay or a ______.

Under the Uniform Commercial Code (UCC) Article 3 principles taught in real estate financing, a negotiable instrument (e.g., a promissory note) must be an unconditional promise or order to pay a fixed amount of money. Thus, if it does not contain an order to pay, it must contain a promise to pay. The amount must be fixed (not “flexible”), and while signatures are required for enforceability, notarization is not a UCC requirement for negotiability.