I need a full-stack solution that lets customers create and manage both voice-based and chat-based GPT-5 agents through a clean, self-service web app. The front end must guide new users through onboarding, let them tweak prompt variables on the fly, and spin up brand-new agents without touching code. On the back end, I will run an admin console that handles user management, detailed analytics, and granular system settings. A separate billing area has to process payments securely, manage recurring subscriptions, and generate branded invoices automatically. Beyond the dashboards, the platform needs a workspace where we can pre-program reusable agent templates for different industries (e-commerce support, real-estate lead capture, healthcare intake, etc.) and push those templates to customers with minimal friction. Everything should be modular so we can add new verticals quickly. Core deliverables • Customer dashboard: onboarding flow, prompt adjustment interface, new agent builder • Admin dashboard: user management, analytics & reporting, system settings panels • Billing dashboard: payment processing, subscription controls, invoice generation • Template studio: internal tool to design, store, and deploy industry-specific GPT-5 agent blueprints • Voice & chat runtimes with secure API endpoints • End-to-end deployment, documentation, and a short hand-over session Successful completion means I can invite a non-technical user, watch them sign up, configure a voice or chat agent from a template or from scratch, pay for a plan, and view usage analytics—without any manual intervention from my team.