PayPal toolkit (TypeScript) exposing PayPal APIs such as invoicing to OpenAI Agents SDK, LangChain, Vercel AI SDK and MCP, plus a hosted remote MCP server.
PayPal docs list remote MCP endpoints https://mcp.paypal.com/http and /sse (sandbox: mcp.sandbox.paypal.com); an unauthenticated probe of /http returned 404 on 2026-10-02.