What should I pay attention to when building a p2p online lending system?

I plan to use php for secondary development. Currently, there are only a few students at school. Security, business logic... what do you need to pay attention? I have no development experience. I hope you can give me some comments. Thank you! For the source code, I plan to buy one from the Internet for the time being. I plan to use php for secondary development. Currently, there are only a few students at school.

Security, business logic... what do you need to pay attention?

I have no development experience. I hope you can give me some comments. Thank you!

For the source code, I plan to buy one from the Internet for the time being.

Reply content:

I plan to use php for secondary development. Currently, there are only a few students at school.

Security, business logic... what do you need to pay attention?

I have no development experience. I hope you can give me some comments. Thank you!

For the source code, I plan to buy one from the Internet for the time being.

Keep a low profile when running

Check whether there is any ready-made system code on the Internet!

Payment convenience risk control convenience lending process I am doing R & D in Internet Finance Companies

Do not post announcements before running

Do not disclose your alma mater's information. The road will be ruined by your alma mater.

I have participated in the development of P2P programs. Note that there will be more points and a few simple columns.

Business logic:
1. Revenue calculation;
2. withdrawal process (a P2P platform has encountered a serious bug in withdrawal payment twice ).
...

Security:
1. We recommend that you use the full-site https protocol;
2. All forms must undergo anti-forgery verification;
3. prevent common security issues such as xss and SQL injection.
...

Add other floors

Do not watch the code as you write it.

Things, things, things ,......

Make sure that data is backed up and locked when writing data.