I'm here to help you get the bank codes you need in connecting your UOB account, @yihao-kuriosity-.
A bank code is a numerical code assigned to a specific bank in order to identify it during financial transactions such as bank transfers. The codes are national and are generally assigned by a country’s central bank or banking body.
You can actually search the bank codes using your browser or contact your UOB bank.
I'm expecting you can connect your UOB bank with the codes provided. Make sure to drop your additional question and I'll be happy to answer them for you.
Let me help you with connecting your bank account, Yihao-kuriosity-.
The security number is the same as the 2-Factor Authentication. It's an extra level of protection to reduce fraud. Aside from calling your bank, you can see this code with your online banking app or website. Or, you also get a text message with the code. Then, you have to type it in our program.