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NetSuite Professionals

I am trying to "Creating a Mapping for the Client Credentials Flow".  The NetSuite manual indicates to Go to _Setup &gt; Integration &gt; Manage Authentication &gt; OAuth 2.0 Client Credentials (M2M) Setup_.

It appears fairly simple and I even got the SSL cert using OpenSSL and the instructions in the above.

But my service is trying to hit it and gets "Unable to retrieve access token for destination id: 1277364, name: IN - NetSuite Sandbox 2."

Does anyone have the details on how to set that up and connect?

that doesnt sound like the actual error from netsuite

general warning is that you are unlikely to get a generic service that supports client credentials to work with netsuite

netsuite uses the assertion framework extension, so its more complicated than normal client credentials