@QuickBooks I built Uncat.com, a QuickBooks Online/Desktop app on your store w/ thousands of firms. BUT, your API is *randomly* expiring OAuth tokens and hurting YOUR customers. 600+ posts on help.developer.intuit.com of the same issue with no solution. Help me.
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To follow up, search "site:help.developer.intuit.com invalid grant". Every support person @Intuit literally copy/pastes the same bullets or links. Yet people come back and say the issue persist.