Fix security flaws

[Rupeshiya]

Describe the enhancement you'd like Fix the security flaws in API's

Describe approaches if you have thought of any

Fixed:

• [X] DOS attack
• [X] XSS attack
• [X] Rate limiter
• [X] CSRF token attack
• [X] Clickjacking attack
• [X] protect against HTTP Parameter Pollution attacks using HPP
• [X] Hide password from client-side
• [X] Hide user tokens