I am currently developing e-commerce software PUBLIC and OPEN SOURCE and want to embed a chat plugin using PHP / MySQL (similar to Facebook). But much easier. You can see the draft preview below.

Functions:
- Send and receive messages (friends only)
- Add / Search / Delete / Block Friends
Security is important as this chat plugin will be embedded in the software and this software will be published as OPEN SOURCE.
My question is where should I go down to record it and how to get good security ?
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