What requirements a banker should ensure in deciding whether the invocation made is proper in case of payment under a bank guarantee?

In case of invocation, the banker is required to ensure that: The invocation is well within the claim period. The amount claimed by way of invocation is not in excess of what is guaranteed. The authority invoking the guarantee has the powers to do so. In the case of Government Departments, the authority to invoke bank guarantee is usually placed in a position by way of delegation and allocation of authority. It is the duty of the banker is to ensure about the authority invoking the bank guarantee.