Meta Auto Login & Posting

I need a developer who can wire my web app to Meta’s APIs so that a visitor can connect both Instagram and Facebook once, then publish videos straight from our interface—no downloading, no jumping over to the native apps. The flow I have in mind is simple: user lands on our site, clicks “Connect,” grants the required Meta permissions for Instagram and Facebook, and, from that point on, every video they create inside the app can be pushed live with a single click.

Key points to cover:
• Unified Facebook Login + Instagram Login handled through Meta’s latest Graph API endpoints.
• Secure token storage and automatic refresh so sessions stay valid without forcing users to reconnect.
• A content-publishing endpoint that supports reels, feed posts and captions exactly as a user would see them in Instagram or Facebook.
• Clear fallback or error handling so failed posts are reported gracefully to the user.

Please show past work that demonstrates you have already completed similar Meta or social-platform integrations; code samples or live links are even better. Once integrated, I’ll test the flow end-to-end on both personal and business accounts before sign-off.