PostHog OAuth refresh token invalid_grant — What it means & how to fix it
Blog post from Nango
The text discusses the challenges and solutions associated with managing OAuth 2.0 token refresh errors when integrating with PostHog. It addresses the common issue of receiving an "invalid_grant" error, which can interrupt data syncs and other processes due to expired, revoked, or stale refresh tokens. Key problems include not using the latest refresh token, user revocation of access, and concurrency issues during token refreshes. The document offers guidance on diagnosing these errors, such as verifying refresh requests and managing token concurrency, and suggests practices to prevent issues, like regular token refreshes and implementing a single-flight mechanism. Additionally, it highlights Nango as a tool that simplifies OAuth handling, offering automatic token refreshing and error management to streamline the integration process.