Getting error "missing credential" from Integration while using in the Process model

Question

Hi Experts, 
 I am using "Authorization Code Grant" for Docusign integration. I have to call this integration on my process model and run this process model as scheduler on every hour to checking token status. I have set assignee of this integration node "Run as whoever started the process". The Problem I am facing is that, every time I am getting "[title=Missing Credentials, message=No OAuth Access Token found for current user, detail=]" API response. when I am manually running this integration, it is working fine. 
 As per my understanding it is because, when the process is running according scheduler it is not able to find valid assignee and the integration is returning false response every time ,even if the token is not expired. 
 Please help me on this.

Peter Lewis · Answer

Yeah can you use Client Credentials Grant instead? That's usually what I see used for automated activities like this where there isn't a user authenticating through a UI. Per the documentation: "Unlike the Authorization Code grant, the Client Credentials grant is used when access is being requested on behalf of an application, not a user."

Getting error "missing credential" from Integration while using in the Process model

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