A support contract is a contract by which the contracting parties enter into or promise another contract. The two treaties are therefore linked and can be applied, even if they are not a constructive part of the original treaty.  In JJ Savage and Sons Pty Ltd v. Blakney, a mere expression of opinion was not deemed sufficient to be kept as a promise. In Crown Melbourne Limited v Cosmopolitan Hotel (Vic) Pty Ltd, a statement from a landlord to the tenants considered when negotiating a lease agreement that they are “supported during the extension” would not bind the lessor to offer another five-year lease.  A support contract is generally a one-time contract that is agreed against the party whose advantage is exploited by the contract to conclude the main or principal contract, which sets additional conditions for the same purpose as the main contract.  For example, an ancillary contract is entered into when one party pays the other party a certain amount for entry into another contract. An ancillary contract may be entered into between one of the parties and a third party. With a two-part security contract, the two parties that enter into the main contract also enter into the security contract. A tripartite support contract includes a debt statement of a third party that does not participate in the original contract.
This. B is often used in the case of a sales contract. Consider De Lassalle v. Guildford, a loan contract case in which the latter part rented a house at the first. The landlord promised to repair the runoff before the tenant moved in. This promise was considered by the court to be a secondary contract that allowed the tenant to sue if he found that the exits had not been fixed as promised. One theory confirms that it is possible to characterize creditworthy letters as an auxiliary contract for a third-party recipient, since letters of credit are driven by the need of the buyer and, in accordation of Jean Domat`s theory, to the cause of a letter of credit, a bank issues a credit in favour of a seller in order to exempt the buyer from his obligation to pay directly to the seller with a legal offer. There are three different companies involved in the letter of credit transaction: the seller, the buyer and the banker.
Therefore, an accreditation contract is theoretically understood as a guarantee contract, which is accepted by a behaviour or, in other words, as a tacit contract.  It is briefly called LOC It can also be reissued as follows: An auxiliary contract is a contract that leads a person to enter into a separate “primary” contract. For example, if X agrees to purchase Y products manufactured accordingly by Z, based on Z`s assurance of the high quality of the goods, X and Z may consider that X and Z have entered into a warranty contract consisting of Z`s promise of quality, which, given X`s promise to enter into the main contract with Y , was given. The main contracts and security contracts are active simultaneously and, in some cases, the provisions of these contracts may replace the provisions of the former. For example, companies X and Y enter into a construction contract with X as the owner and Y as the owner.