What is swift mt399?

SWIFT MT 399 is a message type used in the SWIFT network for free-format messages between financial institutions. It is typically used for communication regarding non-standard transactions or inquiries that do not fit into other predefined message categories. This format allows banks and financial entities to exchange information and clarifications related to various financial matters without adhering to strict guidelines. It is often utilized for operational purposes, such as discussing transaction details or resolving issues.