But in order to successfully manage the trade's delivery and settlement a lot more information needs to be available than is captured in the trade details, such as when payment is due, who needs to notify a TSO etc.
This additional detail is held in a Master Agreement
NBP97 (Short Term Flat NBP Trading Terms and Conditions Ref. NBP 1997) covers natural gas trading at the NBP complete with details of nomination
Master Agreements may reference other Master Agreements - ISDA for example is an organization that is aiming to offer master agreements that unify trading, for example at the NBP and at TTF
Master Agreements are themselves referenced by bilateral trading agreements, which are agreements set up by pairs of potential trading partners to specify which Master Agreements will be used for different products and instruments, and usually cover other arrangements such as netting, collateral etc.
Master Agreements may have schedules or annexes that define additional terms, or override terms in the main agreement
Bilateral Master Agreements may have additional schedules that define variations to the standardized master agreements
A Confirmation, as well as confirming the trade details, also confirms the master agreements that regulate the trade, and may itself contain exceptions or variations from the general bilateral terms