We require a developer with proven experience in Meta (Facebook) APIs to implement and configure full integration for Facebook Pages and Instagram messaging within our platform, and to handle the App Review process. Scope of Work: Meta API Integration Implement Facebook Login (OAuth 2.0) for user authentication. Ensure seamless login without requiring users to manually input tokens. Retrieve and store secure access tokens (short-lived + long-lived) following best practices. Connect and manage: Facebook Pages Instagram Business Accounts (linked to Pages) Permissions Required (App Review) You must prepare and justify the usage of the following permissions: pages_show_list pages_messaging instagram_manage_messages pages_read_engagement public_profile App Review Submission (Mandatory) Record clear videos in English demonstrating: How the system works end-to-end Why each permission is required Real use case: customer communication via Facebook Pages and Instagram DM Ensure videos meet Meta App Review guidelines to maximize approval chances. Messaging Features Enable sending and receiving messages from: Facebook Messenger (Pages) Instagram Direct Messages Webhook setup for real-time message handling Proper handling of message events (read, reply, delivery) Backend Requirements Secure token storage (encrypted) Token refresh logic Webhook verification and event processing Clean, scalable API structure Frontend Requirements Facebook Login button UX flow to: Select Pages Link Instagram accounts Clear status indicators (connected / disconnected) Technical Requirements: Strong experience with Meta Graph API Experience with Facebook App Review process (critical) Knowledge of Webhooks and OAuth flows Ability to work with PHP backend (preferred) and modern JS frontend Deliverables: Fully working integration (Facebook + Instagram messaging) Approved Meta App (or ready for approval with correct submission) App Review videos in English Clean, documented code Deployment-ready solution Important Notes: This is not a basic integration. Prior experience with Meta App Review is required. Approval rate depends heavily on video quality and technical justification. Security and compliance with Meta policies are mandatory. Preferred: Previous projects involving Messenger API or Instagram Messaging API Understanding of rate limits and error handling in Meta APIs