# PinglyMCP > Website services for human developers and AI agents through authenticated REST and MCP. Public documentation requires no login. ## Developer documentation - [Introduction](https://pinglymcp.com/docs): Start with a personal key or OAuth. - [Authentication](https://pinglymcp.com/docs/authentication): Credentials and scopes. - [REST API](https://pinglymcp.com/docs/rest): Endpoints, arguments and examples. - [MCP](https://pinglymcp.com/docs/mcp): Streamable HTTP and tool reference. - [Billing and credits](https://pinglymcp.com/docs/billing): Billing permissions, checkout, subscription previews, operation retries and sandbox payments. - [Pricing](https://pinglymcp.com/pricing): Plans and service credit costs. - [Full plain-text reference](https://pinglymcp.com/llms-full.txt): Catalog-derived service arguments and billing workflow for agents. Billing mutations require billing:manage and account-owner approval. Persist operationKey and reuse it after uncertain outcomes. Check get_billing_account mode before payments: test is sandbox; live moves real money. Card details belong only on hosted Stripe Checkout.