The Indian Contract Act, 1872
50. Performance in manner or at time prescribed or sanctioned by promise –
The performance of any promise may be made in any manner, or at any time which the promisee prescribes or sanctions
(a) B owes A 2,000 rupees. A desires B to pay the amount to A’s account with C, a banker. B, who also banks with C, orders the amount to be transferred from his account to A’s credit, and this is done by C. Afterwards, and before A knows of the transfer, C fails. There has been a good payment by B.
(b) A and B are mutually indebted. A and B settle an account by setting off one item against another, and B pays A the balance found to be due from him upon such settlement. This amounts to a payment by A and B, respectively, of the sums which they owed to each other.
(c) A owes B 2,000 rupees. B accepts some of A’s goods in reduction of the debt. The delivery of the goods operates as a part payment.
(d) A desires B, who owes him Rs.100, to send him a note for Rs.100 by post. The debt is discharged as soon as B puts into the post a letter containing the note duly addressed to A.
Manner and time of performance
If any agreement states that a particular act relating to the furtherance of a contract is to be done in a particular manner, it should be done in that manner and it is not open to the parties to chalk out his own manner of performing his part of contract; Bishamber Nath Agarwal v. Kishan Chand, AIR 1990 All 70.