International oil trading involves a sequence of documents that can look intimidating to anyone encountering them for the first time. Each one serves a specific, logical purpose in moving a transaction from initial interest to completed delivery, and understanding what each document is actually for — rather than just recognising the acronym — makes the entire process far less opaque.
Letter of Intent (LOI)
The LOI is typically the first formal document in a transaction, issued by the buyer to signal serious — but still non-binding — interest in purchasing a specific product. It generally outlines the buyer's general requirements: approximate quantity, product type, and intended delivery terms. An LOI does not commit the buyer to purchase and does not commit the seller to sell; its main function is to move a conversation from informal interest to a documented starting point that both sides can reference as the transaction progresses.
Irrevocable Corporate Purchase Order (ICPO)
The ICPO is a more formal step than the LOI, representing a firmer (though still typically conditional) commitment from the buyer specifying quantity, target price or price formula, delivery terms, and timeline. Despite the word "irrevocable" in the name, an ICPO is generally understood in practice to be conditional on the seller's offer matching the buyer's stated terms and on successful completion of the subsequent due diligence and contracting process — it is not the same as a final, unconditional commitment to purchase regardless of what follows.
Full Corporate Offer (FCO)
In response to an ICPO, a seller issues a Full Corporate Offer — a formal statement confirming the specific product, quantity, price, and delivery terms the seller is prepared to provide, generally accompanied by or followed by some form of proof of product. The FCO is the seller's counterpart to the buyer's ICPO, and the two together typically form the basis for negotiating toward a binding contract.
Proof of Product (POP)
Proof of product refers to documentation demonstrating that the seller genuinely has access to the product being offered — commonly a tank storage receipt, a refinery allocation letter, or similar evidence tied to a specific, named facility. Vague or unverifiable proof of product is one of the most consistent warning signs in non-performing transactions; genuine proof of product can typically be checked, at least in principle, against the named storage facility or refinery.
Sale and Purchase Agreement (SPA)
The SPA is the binding contract between buyer and seller, typically drafted and negotiated with legal counsel on both sides once the ICPO and FCO terms have been broadly agreed. The SPA sets out the full legal terms of the transaction: precise specification, quantity (often with an allowable tolerance), price formula, delivery terms (INCOTERMS), payment instrument and timing, inspection arrangements, and provisions for what happens if either party fails to perform. This is the document that actually creates binding legal obligations — everything before it in the sequence is preparatory.
Non-Circumvention, Non-Disclosure Agreement (NCNDA)
Where intermediaries — brokers or agents — are involved in bringing a buyer and seller together, an NCNDA is commonly used to protect those intermediaries' position. It prevents the principals from "circumventing" the intermediary (dealing directly to avoid paying a commission after being introduced) and restricts disclosure of confidential information shared during the transaction process. NCNDAs are typically signed early, often before detailed commercial terms are exchanged, specifically to protect the intermediary's role before they introduce the parties.
Irrevocable Master Fee Protection Agreement (IMFPA)
Where multiple intermediaries are involved in a transaction chain — not uncommon in larger or more complex deals — an IMFPA sets out how commission is split among them once a transaction successfully closes and payment is made. It typically specifies each intermediary's percentage or fixed fee, and is structured to be paid directly from the transaction proceeds rather than requiring a separate invoice process between intermediaries.
Bank Comfort Letter (BCL)
A BCL is a non-binding letter from a buyer's bank indicating that the buyer maintains sufficient funds or credit standing, generally used early in a transaction to give a seller some assurance of the buyer's financial credibility before more formal payment instruments are arranged. A BCL is not a payment guarantee and should not be treated as equivalent to an SBLC or DLC.
How These Documents Fit Together: A Typical Sequence
- Buyer issues LOI, signalling interest.
- Buyer and seller (and any intermediaries) sign an NCNDA to protect confidentiality and intermediary positions.
- Buyer issues ICPO with specific terms.
- Seller responds with FCO, supported by proof of product.
- If multiple intermediaries are involved, an IMFPA is signed to set out fee splits.
- Buyer and seller negotiate and sign a binding SPA.
- Buyer arranges the agreed payment instrument (DLC, SBLC, or other) per the SPA terms.
- Independent inspection confirms quality and quantity at loading.
- Shipping and customs documentation (bill of lading, certificate of origin) accompanies the cargo to its destination.
Not every transaction follows this exact sequence in this exact order — smaller or repeat transactions between established counterparties sometimes compress or skip steps that first-time or larger transactions would include. But understanding the full sequence helps explain why each document exists and what risk it is designed to manage at that stage of the process.
A Final Note on Documentation Red Flags
Genuine transactions generally move through this documentation sequence in a logical order, with each document supporting the next. Requests to skip steps — for example, pressure to sign an SPA or release payment before any proof of product has been provided, or insistence that standard documents like an NCNDA are "unnecessary formalities" — are worth treating as a signal to slow down and verify more carefully, regardless of how the request is framed.