Stripe OAuth refresh token invalid_grant — What it means & how to fix it

Integrating with Stripe's API using OAuth 2.0 often encounters refresh token errors, particularly the invalid_grant error, which disrupts payment processing and account synchronization. These errors usually occur when a refresh token becomes invalid, expired, or revoked, often due to using stale tokens after rotation or unauthorized reuse of authorization codes. To address these issues, it is crucial to always use the latest refresh token, verify the accuracy of refresh requests, and prevent concurrency issues by treating refresh tokens as shared resources. Additionally, maintaining a proactive approach in token management, such as refreshing before expiration and implementing a robust re-authentication process, can minimize disruptions. Utilizing tools like Nango for automatic token management can also simplify handling these complexities, allowing developers to focus more on product features.