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The Three-Step-TBA-Auth flow.  Was this an early version of the oauth 2.0 Authorization Code Flow?  Where an end user has to approve access?

What I'm looking for is Client Credentials Flow, where a trusted integration can request a access token using the client secrets.... Is the best thing to do to keep using OAuth 1.0 TBA?

there are multiple ways to get tokens using oauth 2

netsuite implemented code grant, which involves a user logging into netsuite and granting access to your integration

netsuite has not implemented other grant types like client credentials which would allow obtaining tokens without a user

and that's what I'm looking for.  I have a service that needs to make regular updates into netsuite.  I'd rather have it pull a client id/secret out of a secrets-manager and request an access token.

continue using the IssueToken endpoint, though netsuite wants you to stop using it

I'll keep using client id/secret token id/secret for now then