Runs connection diagnostics against configured QuickBooks tenant. Both /api/v1/integrations/quickbooks/* and /api/v1/quickbooks/* map to the same ApiQuickBooksController method (testConnection). This family uses route handlers that instantiate ApiQuickBooksController and usually wrap calls in explicit try/catch handleApiError blocks.
Content type: application/json · schema QuickBooksV1ConnectionTestBody
clientInfoitemscustomersfullSuccess response 200 · schema QuickBooksV1ApiSuccess