I run ePanMitra.com, a portal that already generates and corrects PAN cards, and I’m ready to open up the underlying service as a commercial API. I need a specialist who can turn the existing internal endpoints into well-structured public documentation and design a straightforward pay-as-you-go user plan. The documentation must live inside my portal, look professional on both desktop and mobile, and cover everything a developer needs to get productive fast: every endpoint and method, detailed error codes with handling advice, plus the rate limits and quota rules that match the plan you help me define. Authentication will be handled through API keys only, so the docs should include key creation, usage and rotation guidelines. For the user plan, I want a single pay-as-you-go model that clearly states price per successful request, minimum monthly commitment (if any), and automatic throttling once the quota is reached. Please suggest reasonable tier breakpoints, overage pricing, and the wording for terms of service so I can copy it directly into the site. Deliverables: • Markdown or HTML documentation ready to embed in ePanMitra.com, with sample curl and language snippets (preferably PHP and Node.js). • A concise pricing and quota matrix for the pay-as-you-go model. • Postman or Swagger (OpenAPI 3) collection that mirrors the docs so developers can test immediately. • Brief guide on how to update the docs when endpoints change. I’ll give you access to the existing internal Postman collection and database schema once we start, and I’m happy to walk through the workflow to clarify any edge cases. Looking forward to a clean, developer-friendly deliverable that lets me start onboarding resellers right away.