Xero OAuth refresh token invalid_grant — What it means & how to fix it
Blog post from Nango
Integrating with Xero's accounting API using OAuth 2.0 often leads to refresh token errors, commonly resulting in "invalid_grant" issues that disrupt workflows such as invoice syncing and transaction imports. The text outlines how to diagnose and resolve these errors, emphasizing the importance of using the latest refresh token due to Xero's practice of invalidating old tokens upon issuing new ones. It highlights common causes of token failures, including using stale tokens, expired tokens due to inactivity, user revocations, and concurrency issues in token refresh processes. Recommendations include ensuring only one refresh operation per connection, proactively refreshing tokens before expiration, and investing in a user-friendly re-authorization process. The text also suggests leveraging tools like Nango for managing OAuth token lifecycle complexities, offering features such as automatic token refreshing and built-in error handling to facilitate smoother integration with Xero's APIs.
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