We need an expert React/JavaScript Developer to fix last errors to finalize our payment and complete subscription lifecycle management system. The application is hosted on Hostinger Horizon using Supabase for the backend (Edge Functions). The Project Goal (MVP): To fix last errors to establish a fully functional, end-to-end Paddle V2 subscription flow, ensuring systematic payment, renewal, upgrade, and downgrade handling within the application ( it's already there, but need to fix something ). The Problem: Our current Paddle checkout process is broken on the frontend. We are encountering persistent errors that prevent the user from successfully initiating the Paddle overlay, despite the backend successfully generating the required checkout URLs. The process fails to transition the user from the pricing page to the actual payment window. Required Expertise: Full Debugging and Fix: Diagnose and fix all issues preventing the successful launch of the Paddle V2 Checkout Overlay from the pricing page (e.g., handling transaction ID extraction, initialization, and correct API response processing). Subscription Lifecycle Logic: Ensure seamless, systematic handling of New Subscriptions, Automatic Renewals, Upgrades, and Downgrades, and correctly reflecting the user's subscription status in the Supabase database. Code Environment: Must be comfortable working in a self-contained, live Hostinger Horizon development environment, which requires familiarity with debugging and manual file modification within the platform's constraints. This is a high-priority, quick-fix job. Please highlight your specific experience with Paddle V2 integrations.