SWIFT ISO 15022 - Code TFIN Financial acronyms The entire acronym collection of this site is now also available offline with this new app for iPhone and iPad. Meaning Trade Finance: Documentary credits, collections, guarantees, letters of credit. Usages Message type Field number Tag MT670 (Standing Settlement Instruction Update Notification Request) 21 22F (Indicator) MT671 (Standing Settlement Instruction Update Notification) 16 22F (Indicator)