Xero API 2026 Integration Guide: OAuth 2.0, Tenant Routing, and Key Changes

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Developer Ilshaad Kheerdali published a comprehensive Xero API integration guide on August 4, 2026, covering OAuth 2.0 authentication, tenant routing, rate limits, and incremental data updates. The guide highlights that Xero's tenant model requires an extra discovery step after authorization, where developers must query which organisations a token can access — a step absent in APIs like Stripe. Two notable 2026 changes to Xero's scoping and pricing structure are addressed, which affect how integrations are planned and budgeted. The tutorial targets the Xero Accounting API exclusively over OAuth 2.0, noting that the older OAuth 1.0a is fully retired and any guides referencing it are outdated. A no-code path to PostgreSQL is also covered for developers who prefer to skip building the API plumbing themselves.

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