SWIFT (Society for Worldwide Interbank Financial Telecommunication) is the global financial system that allows immediate and secure transfers of money across borders. It is the web that verifies all financial transactions. It links 11,000 banks and institutions in more than 200 countries, with 40 million messages a day. Using SWIFT ensures that transactions happen in seconds in a secure way. Around 1% of those messages involve Russian payments, according to the BBC.