Open banking lets third-party service providers (TPPs) connect to application programming interfaces (APIs) available from financial institutions. Those APIs give access to the available balance in a bank account, transaction histories of a bank account, or access into a bank account to move funds. The European Commission’s PSD2 regulations, which will go into full effect in September 2019, compel banks in the European Economic Area (EEA) to provide regulated third-party service providers with access to data and payment attributes. PSD2 was the catalyst for Mastercard to create an Open Ba...