PSD2 requires European banks to provide communication interfaces to Third Party Providers (TPPs) These interfaces, generally referred to as APIs, will allow TPPs to build innovative financial services on top of the services provided by banks. The security and privacy threats against the APIs of banks are discussed in this white paper. How to protect APIs against security threats and how to protect API security is discussed in the paper. Learn about the requirements for open banking APIs and how they are used to build new financial services.”]
Source: https://www.bankinfosecurity.com/whitepapers/open-banking-apis-psd2-w-4573