1, the banking system, most of the core business of the bank is C. The core of the bank has an interface with the outside, so you need to know the interface call.

2. Payment business, the process is generally a standard general payment process.

3. Security and performance: Security mainly ensures the consistency, integrity and non-repudiation of transactions. According to the encryption algorithm and certificate provided by the bank, data should be encrypted during transmission.

That's basically it.