Excuse me, what is API interface and what does it mean?

The bank ATM can be understood as a materialized API interface, and the whole process of withdrawing money can be understood as the process of calling the interface: we input the account password and withdrawal amount into the ATM, which is equivalent to the process of passing parameters to the API interface, and then the ATM spits out money, which is equivalent to the interface returning parameters. If you still don't understand, you can actually experience it on the UFIDA APILink platform.