Enhance Platform Auth & Payments

I’m upgrading the core functionality of my platform and need a developer who can focus on three areas: robust user authentication, seamless payment processing, and insightful data-analytics integration.

1. User authentication
My current login flow is basic and I’d like to expand it. Email + password is a must, but I’m open to adding social logins or even 2-factor security if you feel it strengthens the stack without over-engineering things.

2. Payment processing
Transactions will run directly inside the app, so I need secure, PCI-compliant payment handling with clear error reporting and webhook support for status updates. Experience with Stripe or a comparable gateway is preferred.

3. Data analytics integration
I want actionable metrics—not vanity numbers. Help me wire up an analytics solution (Google Analytics 4, Mixpanel, or another option you recommend) that tracks user behaviour from sign-up through checkout and surfaces it in easy-to-read dashboards.

Acceptance criteria
• Auth flow is live, tested, and secure.
• Payments process end-to-end in both sandbox and production modes.
• Analytics events fire accurately and appear in the chosen dashboard.

Code should be clean, documented, and committed to my Git repo via pull requests so I can review each milestone. Let me know which frameworks, SDKs, or APIs you plan to use and a realistic timeline to get this shipped.