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QuickBooks Online MCP server: 18 tools over invoices, customers and payments, real OAuth 2.1 authorization-code + PKCE with token refresh, client-side rate limiting that honors QBO throttles, stdio and streamable HTTP, offline test suite. Works with Claude Desktop or any MCP client.
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| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-23 | F | 21 | 2026-07-28+ | v2 |