Invalid Grant Error

If you're getting the following error when authenticating with the QuickBooks Online API:

according to the QuickBooks Online help article you might get this error for a number of reasons including:

  • the refresh token has expired
  • you are using an old refresh token instead of the latest one
  • the refresh token has been revoked

The only way to solve this error is to re-authenticate so you can get a new authorization code.

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